exiwhat: Ensure the SIGUSR1 signal handler is safe.
[exim.git] / src / src / exim.c
CommitLineData
73a46702 1/* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
059ec3d9
PH
2
3/*************************************************
4* Exim - an Internet mail transport agent *
5*************************************************/
6
0a49a7a4 7/* Copyright (c) University of Cambridge 1995 - 2009 */
059ec3d9
PH
8/* See the file NOTICE for conditions of use and distribution. */
9
10
11/* The main function: entry point, initialization, and high-level control.
12Also a few functions that don't naturally fit elsewhere. */
13
14
15#include "exim.h"
16
6545de78
PP
17extern void init_lookup_list(void);
18
059ec3d9
PH
19
20
21/*************************************************
22* Function interface to store functions *
23*************************************************/
24
25/* We need some real functions to pass to the PCRE regular expression library
26for store allocation via Exim's store manager. The normal calls are actually
27macros that pass over location information to make tracing easier. These
28functions just interface to the standard macro calls. A good compiler will
29optimize out the tail recursion and so not make them too expensive. There
30are two sets of functions; one for use when we want to retain the compiled
31regular expression for a long time; the other for short-term use. */
32
33static void *
34function_store_get(size_t size)
35{
36return store_get((int)size);
37}
38
39static void
40function_dummy_free(void *block) { block = block; }
41
42static void *
43function_store_malloc(size_t size)
44{
45return store_malloc((int)size);
46}
47
48static void
49function_store_free(void *block)
50{
51store_free(block);
52}
53
54
55
56
57/*************************************************
58* Compile regular expression and panic on fail *
59*************************************************/
60
61/* This function is called when failure to compile a regular expression leads
62to a panic exit. In other cases, pcre_compile() is called directly. In many
63cases where this function is used, the results of the compilation are to be
64placed in long-lived store, so we temporarily reset the store management
65functions that PCRE uses if the use_malloc flag is set.
66
67Argument:
68 pattern the pattern to compile
69 caseless TRUE if caseless matching is required
70 use_malloc TRUE if compile into malloc store
71
72Returns: pointer to the compiled pattern
73*/
74
75const pcre *
76regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77{
78int offset;
79int options = PCRE_COPT;
80const pcre *yield;
81const uschar *error;
82if (use_malloc)
83 {
84 pcre_malloc = function_store_malloc;
85 pcre_free = function_store_free;
86 }
87if (caseless) options |= PCRE_CASELESS;
88yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
89pcre_malloc = function_store_get;
90pcre_free = function_dummy_free;
91if (yield == NULL)
92 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
93 "%s at offset %d while compiling %s", error, offset, pattern);
94return yield;
95}
96
97
98
99
100/*************************************************
101* Execute regular expression and set strings *
102*************************************************/
103
104/* This function runs a regular expression match, and sets up the pointers to
105the matched substrings.
106
107Arguments:
108 re the compiled expression
109 subject the subject string
110 options additional PCRE options
111 setup if < 0 do full setup
112 if >= 0 setup from setup+1 onwards,
113 excluding the full matched string
114
115Returns: TRUE or FALSE
116*/
117
118BOOL
119regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
120{
121int ovector[3*(EXPAND_MAXN+1)];
122int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
123 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
124BOOL yield = n >= 0;
125if (n == 0) n = EXPAND_MAXN + 1;
126if (yield)
127 {
128 int nn;
129 expand_nmax = (setup < 0)? 0 : setup + 1;
130 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
131 {
132 expand_nstring[expand_nmax] = subject + ovector[nn];
133 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
134 }
135 expand_nmax--;
136 }
137return yield;
138}
139
140
141
142
143/*************************************************
921b12ca
TF
144* Set up processing details *
145*************************************************/
146
147/* Save a text string for dumping when SIGUSR1 is received.
148Do checks for overruns.
149
150Arguments: format and arguments, as for printf()
151Returns: nothing
152*/
153
154void
155set_process_info(const char *format, ...)
156{
157int len;
158va_list ap;
159sprintf(CS process_info, "%5d ", (int)getpid());
160len = Ustrlen(process_info);
161va_start(ap, format);
162if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
163 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
164len = Ustrlen(process_info);
165process_info[len+0] = '\n';
166process_info[len+1] = '\0';
167process_info_len = len + 1;
168DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
169va_end(ap);
170}
171
172
173
174
175/*************************************************
059ec3d9
PH
176* Handler for SIGUSR1 *
177*************************************************/
178
179/* SIGUSR1 causes any exim process to write to the process log details of
180what it is currently doing. It will only be used if the OS is capable of
181setting up a handler that causes automatic restarting of any system call
182that is in progress at the time.
183
921b12ca
TF
184This function takes care to be signal-safe.
185
059ec3d9
PH
186Argument: the signal number (SIGUSR1)
187Returns: nothing
188*/
189
190static void
191usr1_handler(int sig)
192{
921b12ca
TF
193int fd;
194
195os_restarting_signal(sig, usr1_handler);
196
197fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
198if (fd < 0)
199 {
200 /* If we are already running as the Exim user, try to create it in the
201 current process (assuming spool_directory exists). Otherwise, if we are
202 root, do the creation in an exim:exim subprocess. */
203
204 int euid = geteuid();
205 if (euid == exim_uid)
206 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
207 else if (euid == root_uid)
208 fd = log_create_as_exim(process_log_path);
209 }
210
211/* If we are neither exim nor root, or if we failed to create the log file,
212give up. There is not much useful we can do with errors, since we don't want
213to disrupt whatever is going on outside the signal handler. */
214
215if (fd < 0) return;
216
217(void)write(fd, process_info, process_info_len);
218(void)close(fd);
059ec3d9
PH
219}
220
221
222
223/*************************************************
224* Timeout handler *
225*************************************************/
226
227/* This handler is enabled most of the time that Exim is running. The handler
228doesn't actually get used unless alarm() has been called to set a timer, to
229place a time limit on a system call of some kind. When the handler is run, it
230re-enables itself.
231
232There are some other SIGALRM handlers that are used in special cases when more
233than just a flag setting is required; for example, when reading a message's
234input. These are normally set up in the code module that uses them, and the
235SIGALRM handler is reset to this one afterwards.
236
237Argument: the signal value (SIGALRM)
238Returns: nothing
239*/
240
241void
242sigalrm_handler(int sig)
243{
244sig = sig; /* Keep picky compilers happy */
245sigalrm_seen = TRUE;
246os_non_restarting_signal(SIGALRM, sigalrm_handler);
247}
248
249
250
251/*************************************************
252* Sleep for a fractional time interval *
253*************************************************/
254
255/* This function is called by millisleep() and exim_wait_tick() to wait for a
256period of time that may include a fraction of a second. The coding is somewhat
eb2c0248
PH
257tedious. We do not expect setitimer() ever to fail, but if it does, the process
258will wait for ever, so we panic in this instance. (There was a case of this
259when a bug in a function that calls milliwait() caused it to pass invalid data.
7086e875 260That's when I added the check. :-)
059ec3d9
PH
261
262Argument: an itimerval structure containing the interval
263Returns: nothing
264*/
265
266static void
267milliwait(struct itimerval *itval)
268{
269sigset_t sigmask;
270sigset_t old_sigmask;
271(void)sigemptyset(&sigmask); /* Empty mask */
272(void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
273(void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
7086e875 274if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
eb2c0248
PH
275 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
276 "setitimer() failed: %s", strerror(errno));
059ec3d9
PH
277(void)sigfillset(&sigmask); /* All signals */
278(void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
279(void)sigsuspend(&sigmask); /* Until SIGALRM */
280(void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
281}
282
283
284
285
286/*************************************************
287* Millisecond sleep function *
288*************************************************/
289
290/* The basic sleep() function has a granularity of 1 second, which is too rough
291in some cases - for example, when using an increasing delay to slow down
292spammers.
293
294Argument: number of millseconds
295Returns: nothing
296*/
297
298void
299millisleep(int msec)
300{
301struct itimerval itval;
302itval.it_interval.tv_sec = 0;
303itval.it_interval.tv_usec = 0;
304itval.it_value.tv_sec = msec/1000;
305itval.it_value.tv_usec = (msec % 1000) * 1000;
306milliwait(&itval);
307}
308
309
310
311/*************************************************
312* Compare microsecond times *
313*************************************************/
314
315/*
316Arguments:
317 tv1 the first time
318 tv2 the second time
319
320Returns: -1, 0, or +1
321*/
322
323int
324exim_tvcmp(struct timeval *t1, struct timeval *t2)
325{
326if (t1->tv_sec > t2->tv_sec) return +1;
327if (t1->tv_sec < t2->tv_sec) return -1;
328if (t1->tv_usec > t2->tv_usec) return +1;
329if (t1->tv_usec < t2->tv_usec) return -1;
330return 0;
331}
332
333
334
335
336/*************************************************
337* Clock tick wait function *
338*************************************************/
339
340/* Exim uses a time + a pid to generate a unique identifier in two places: its
341message IDs, and in file names for maildir deliveries. Because some OS now
342re-use pids within the same second, sub-second times are now being used.
343However, for absolute certaintly, we must ensure the clock has ticked before
344allowing the relevant process to complete. At the time of implementation of
345this code (February 2003), the speed of processors is such that the clock will
346invariably have ticked already by the time a process has done its job. This
347function prepares for the time when things are faster - and it also copes with
348clocks that go backwards.
349
350Arguments:
351 then_tv A timeval which was used to create uniqueness; its usec field
352 has been rounded down to the value of the resolution.
353 We want to be sure the current time is greater than this.
354 resolution The resolution that was used to divide the microseconds
355 (1 for maildir, larger for message ids)
356
357Returns: nothing
358*/
359
360void
361exim_wait_tick(struct timeval *then_tv, int resolution)
362{
363struct timeval now_tv;
364long int now_true_usec;
365
366(void)gettimeofday(&now_tv, NULL);
367now_true_usec = now_tv.tv_usec;
368now_tv.tv_usec = (now_true_usec/resolution) * resolution;
369
370if (exim_tvcmp(&now_tv, then_tv) <= 0)
371 {
372 struct itimerval itval;
373 itval.it_interval.tv_sec = 0;
374 itval.it_interval.tv_usec = 0;
375 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
376 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
377
378 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
379 negative value for the microseconds is possible only in the case when "now"
380 is more than a second less than "then". That means that itval.it_value.tv_sec
381 is greater than zero. The following correction is therefore safe. */
382
383 if (itval.it_value.tv_usec < 0)
384 {
385 itval.it_value.tv_usec += 1000000;
386 itval.it_value.tv_sec -= 1;
387 }
388
389 DEBUG(D_transport|D_receive)
390 {
391 if (!running_in_test_harness)
392 {
393 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
394 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
395 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
396 itval.it_value.tv_usec);
397 }
398 }
399
400 milliwait(&itval);
401 }
402}
403
404
405
406
407/*************************************************
2632889e
PH
408* Call fopen() with umask 777 and adjust mode *
409*************************************************/
410
411/* Exim runs with umask(0) so that files created with open() have the mode that
412is specified in the open() call. However, there are some files, typically in
413the spool directory, that are created with fopen(). They end up world-writeable
414if no precautions are taken. Although the spool directory is not accessible to
415the world, this is an untidiness. So this is a wrapper function for fopen()
416that sorts out the mode of the created file.
417
418Arguments:
419 filename the file name
420 options the fopen() options
421 mode the required mode
422
423Returns: the fopened FILE or NULL
424*/
425
426FILE *
1ba28e2b 427modefopen(const uschar *filename, const char *options, mode_t mode)
2632889e 428{
67d175de
PH
429mode_t saved_umask = umask(0777);
430FILE *f = Ufopen(filename, options);
431(void)umask(saved_umask);
2632889e
PH
432if (f != NULL) (void)fchmod(fileno(f), mode);
433return f;
434}
435
436
437
438
439/*************************************************
059ec3d9
PH
440* Ensure stdin, stdout, and stderr exist *
441*************************************************/
442
443/* Some operating systems grumble if an exec() happens without a standard
444input, output, and error (fds 0, 1, 2) being defined. The worry is that some
445file will be opened and will use these fd values, and then some other bit of
446code will assume, for example, that it can write error messages to stderr.
447This function ensures that fds 0, 1, and 2 are open if they do not already
448exist, by connecting them to /dev/null.
449
450This function is also used to ensure that std{in,out,err} exist at all times,
451so that if any library that Exim calls tries to use them, it doesn't crash.
452
453Arguments: None
454Returns: Nothing
455*/
456
457void
458exim_nullstd(void)
459{
460int i;
461int devnull = -1;
462struct stat statbuf;
463for (i = 0; i <= 2; i++)
464 {
465 if (fstat(i, &statbuf) < 0 && errno == EBADF)
466 {
467 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
468 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
469 string_open_failed(errno, "/dev/null"));
1fe64dcc 470 if (devnull != i) (void)dup2(devnull, i);
059ec3d9
PH
471 }
472 }
1fe64dcc 473if (devnull > 2) (void)close(devnull);
059ec3d9
PH
474}
475
476
477
478
479/*************************************************
480* Close unwanted file descriptors for delivery *
481*************************************************/
482
483/* This function is called from a new process that has been forked to deliver
484an incoming message, either directly, or using exec.
485
486We want any smtp input streams to be closed in this new process. However, it
487has been observed that using fclose() here causes trouble. When reading in -bS
488input, duplicate copies of messages have been seen. The files will be sharing a
489file pointer with the parent process, and it seems that fclose() (at least on
490some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
491least sometimes. Hence we go for closing the underlying file descriptors.
492
493If TLS is active, we want to shut down the TLS library, but without molesting
494the parent's SSL connection.
495
496For delivery of a non-SMTP message, we want to close stdin and stdout (and
497stderr unless debugging) because the calling process might have set them up as
498pipes and be waiting for them to close before it waits for the submission
499process to terminate. If they aren't closed, they hold up the calling process
500until the initial delivery process finishes, which is not what we want.
501
502Exception: We do want it for synchronous delivery!
503
504And notwithstanding all the above, if D_resolver is set, implying resolver
505debugging, leave stdout open, because that's where the resolver writes its
506debugging output.
507
508When we close stderr (which implies we've also closed stdout), we also get rid
509of any controlling terminal.
510
511Arguments: None
512Returns: Nothing
513*/
514
515static void
516close_unwanted(void)
517{
518if (smtp_input)
519 {
520 #ifdef SUPPORT_TLS
521 tls_close(FALSE); /* Shut down the TLS library */
522 #endif
1fe64dcc
PH
523 (void)close(fileno(smtp_in));
524 (void)close(fileno(smtp_out));
059ec3d9
PH
525 smtp_in = NULL;
526 }
527else
528 {
1fe64dcc
PH
529 (void)close(0); /* stdin */
530 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
531 if (debug_selector == 0) /* stderr */
059ec3d9
PH
532 {
533 if (!synchronous_delivery)
534 {
1fe64dcc 535 (void)close(2);
059ec3d9
PH
536 log_stderr = NULL;
537 }
538 (void)setsid();
539 }
540 }
541}
542
543
544
545
546/*************************************************
547* Set uid and gid *
548*************************************************/
549
550/* This function sets a new uid and gid permanently, optionally calling
551initgroups() to set auxiliary groups. There are some special cases when running
552Exim in unprivileged modes. In these situations the effective uid will not be
553root; if we already have the right effective uid/gid, and don't need to
554initialize any groups, leave things as they are.
555
556Arguments:
557 uid the uid
558 gid the gid
559 igflag TRUE if initgroups() wanted
560 msg text to use in debugging output and failure log
561
562Returns: nothing; bombs out on failure
563*/
564
565void
566exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
567{
568uid_t euid = geteuid();
569gid_t egid = getegid();
570
571if (euid == root_uid || euid != uid || egid != gid || igflag)
572 {
573 /* At least one OS returns +1 for initgroups failure, so just check for
574 non-zero. */
575
576 if (igflag)
577 {
578 struct passwd *pw = getpwuid(uid);
579 if (pw != NULL)
580 {
581 if (initgroups(pw->pw_name, gid) != 0)
582 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
583 (long int)uid, strerror(errno));
584 }
585 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
586 "no passwd entry for uid=%ld", (long int)uid);
587 }
588
589 if (setgid(gid) < 0 || setuid(uid) < 0)
590 {
591 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
592 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
593 }
594 }
595
596/* Debugging output included uid/gid and all groups */
597
598DEBUG(D_uid)
599 {
cd59ab18 600 int group_count, save_errno;
059ec3d9
PH
601 gid_t group_list[NGROUPS_MAX];
602 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
603 (long int)geteuid(), (long int)getegid(), (long int)getpid());
604 group_count = getgroups(NGROUPS_MAX, group_list);
cd59ab18 605 save_errno = errno;
059ec3d9
PH
606 debug_printf(" auxiliary group list:");
607 if (group_count > 0)
608 {
609 int i;
610 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
611 }
cd59ab18
PP
612 else if (group_count < 0)
613 debug_printf(" <error: %s>", strerror(save_errno));
059ec3d9
PH
614 else debug_printf(" <none>");
615 debug_printf("\n");
616 }
617}
618
619
620
621
622/*************************************************
623* Exit point *
624*************************************************/
625
626/* Exim exits via this function so that it always clears up any open
627databases.
628
629Arguments:
630 rc return code
631
632Returns: does not return
633*/
634
635void
636exim_exit(int rc)
637{
638search_tidyup();
639DEBUG(D_any)
640 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
641 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
642exit(rc);
643}
644
645
646
647
648/*************************************************
649* Extract port from host address *
650*************************************************/
651
652/* Called to extract the port from the values given to -oMa and -oMi.
b90c388a
PH
653It also checks the syntax of the address, and terminates it before the
654port data when a port is extracted.
059ec3d9
PH
655
656Argument:
657 address the address, with possible port on the end
658
659Returns: the port, or zero if there isn't one
660 bombs out on a syntax error
661*/
662
663static int
664check_port(uschar *address)
665{
7cd1141b 666int port = host_address_extract_port(address);
8e669ac1 667if (string_is_ip_address(address, NULL) == 0)
059ec3d9
PH
668 {
669 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
670 exit(EXIT_FAILURE);
671 }
672return port;
673}
674
675
676
677/*************************************************
678* Test/verify an address *
679*************************************************/
680
681/* This function is called by the -bv and -bt code. It extracts a working
682address from a full RFC 822 address. This isn't really necessary per se, but it
683has the effect of collapsing source routes.
684
685Arguments:
686 s the address string
687 flags flag bits for verify_address()
688 exit_value to be set for failures
689
a5a28604 690Returns: nothing
059ec3d9
PH
691*/
692
693static void
694test_address(uschar *s, int flags, int *exit_value)
695{
696int start, end, domain;
697uschar *parse_error = NULL;
698uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
699 FALSE);
700if (address == NULL)
701 {
702 fprintf(stdout, "syntax error: %s\n", parse_error);
703 *exit_value = 2;
704 }
705else
706 {
707 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
4deaf07d 708 -1, -1, NULL, NULL, NULL);
059ec3d9
PH
709 if (rc == FAIL) *exit_value = 2;
710 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
711 }
712}
713
714
715
716/*************************************************
059ec3d9
PH
717* Show supported features *
718*************************************************/
719
4b2241d2
PP
720/* This function is called for -bV/--version and for -d to output the optional
721features of the current Exim binary.
059ec3d9
PH
722
723Arguments: a FILE for printing
724Returns: nothing
725*/
726
727static void
728show_whats_supported(FILE *f)
729{
730#ifdef DB_VERSION_STRING
731fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
732#elif defined(BTREEVERSION) && defined(HASHVERSION)
733 #ifdef USE_DB
734 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
735 #else
736 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
737 #endif
738#elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
739fprintf(f, "Probably ndbm\n");
740#elif defined(USE_TDB)
741fprintf(f, "Using tdb\n");
742#else
743 #ifdef USE_GDBM
744 fprintf(f, "Probably GDBM (native mode)\n");
745 #else
746 fprintf(f, "Probably GDBM (compatibility mode)\n");
747 #endif
748#endif
749
750fprintf(f, "Support for:");
9cec981f
PH
751#ifdef SUPPORT_CRYPTEQ
752 fprintf(f, " crypteq");
753#endif
059ec3d9
PH
754#if HAVE_ICONV
755 fprintf(f, " iconv()");
756#endif
757#if HAVE_IPV6
758 fprintf(f, " IPv6");
759#endif
79378e0f
PH
760#ifdef HAVE_SETCLASSRESOURCES
761 fprintf(f, " use_setclassresources");
929ba01c 762#endif
059ec3d9
PH
763#ifdef SUPPORT_PAM
764 fprintf(f, " PAM");
765#endif
766#ifdef EXIM_PERL
767 fprintf(f, " Perl");
768#endif
1a46a8c5
PH
769#ifdef EXPAND_DLFUNC
770 fprintf(f, " Expand_dlfunc");
771#endif
059ec3d9
PH
772#ifdef USE_TCP_WRAPPERS
773 fprintf(f, " TCPwrappers");
774#endif
775#ifdef SUPPORT_TLS
776 #ifdef USE_GNUTLS
777 fprintf(f, " GnuTLS");
778 #else
779 fprintf(f, " OpenSSL");
780 #endif
781#endif
b2f5a032
PH
782#ifdef SUPPORT_TRANSLATE_IP_ADDRESS
783 fprintf(f, " translate_ip_address");
784#endif
f174f16e
PH
785#ifdef SUPPORT_MOVE_FROZEN_MESSAGES
786 fprintf(f, " move_frozen_messages");
787#endif
8523533c
TK
788#ifdef WITH_CONTENT_SCAN
789 fprintf(f, " Content_Scanning");
790#endif
80a47a2c
TK
791#ifndef DISABLE_DKIM
792 fprintf(f, " DKIM");
793#endif
8523533c
TK
794#ifdef WITH_OLD_DEMIME
795 fprintf(f, " Old_Demime");
796#endif
797#ifdef EXPERIMENTAL_SPF
798 fprintf(f, " Experimental_SPF");
799#endif
800#ifdef EXPERIMENTAL_SRS
801 fprintf(f, " Experimental_SRS");
802#endif
803#ifdef EXPERIMENTAL_BRIGHTMAIL
804 fprintf(f, " Experimental_Brightmail");
805#endif
6a8f9482
TK
806#ifdef EXPERIMENTAL_DCC
807 fprintf(f, " Experimental_DCC");
808#endif
059ec3d9
PH
809fprintf(f, "\n");
810
e6d225ae
DW
811fprintf(f, "Lookups (built-in):");
812#if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
059ec3d9
PH
813 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
814#endif
e6d225ae 815#if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
059ec3d9
PH
816 fprintf(f, " cdb");
817#endif
e6d225ae 818#if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
059ec3d9
PH
819 fprintf(f, " dbm dbmnz");
820#endif
e6d225ae 821#if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
059ec3d9
PH
822 fprintf(f, " dnsdb");
823#endif
e6d225ae 824#if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
059ec3d9
PH
825 fprintf(f, " dsearch");
826#endif
e6d225ae 827#if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
059ec3d9
PH
828 fprintf(f, " ibase");
829#endif
e6d225ae 830#if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
059ec3d9
PH
831 fprintf(f, " ldap ldapdn ldapm");
832#endif
e6d225ae 833#if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
059ec3d9
PH
834 fprintf(f, " mysql");
835#endif
e6d225ae 836#if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
059ec3d9
PH
837 fprintf(f, " nis nis0");
838#endif
e6d225ae 839#if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
059ec3d9
PH
840 fprintf(f, " nisplus");
841#endif
e6d225ae 842#if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
059ec3d9
PH
843 fprintf(f, " oracle");
844#endif
e6d225ae 845#if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
059ec3d9
PH
846 fprintf(f, " passwd");
847#endif
e6d225ae 848#if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
059ec3d9
PH
849 fprintf(f, " pgsql");
850#endif
e6d225ae 851#if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
13b685f9
PH
852 fprintf(f, " sqlite");
853#endif
e6d225ae 854#if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
059ec3d9
PH
855 fprintf(f, " testdb");
856#endif
e6d225ae 857#if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
059ec3d9
PH
858 fprintf(f, " whoson");
859#endif
860fprintf(f, "\n");
861
862fprintf(f, "Authenticators:");
863#ifdef AUTH_CRAM_MD5
864 fprintf(f, " cram_md5");
865#endif
866#ifdef AUTH_CYRUS_SASL
867 fprintf(f, " cyrus_sasl");
868#endif
14aa5a05
PH
869#ifdef AUTH_DOVECOT
870 fprintf(f, " dovecot");
871#endif
059ec3d9
PH
872#ifdef AUTH_PLAINTEXT
873 fprintf(f, " plaintext");
874#endif
875#ifdef AUTH_SPA
876 fprintf(f, " spa");
877#endif
878fprintf(f, "\n");
879
880fprintf(f, "Routers:");
881#ifdef ROUTER_ACCEPT
882 fprintf(f, " accept");
883#endif
884#ifdef ROUTER_DNSLOOKUP
885 fprintf(f, " dnslookup");
886#endif
887#ifdef ROUTER_IPLITERAL
888 fprintf(f, " ipliteral");
889#endif
890#ifdef ROUTER_IPLOOKUP
891 fprintf(f, " iplookup");
892#endif
893#ifdef ROUTER_MANUALROUTE
894 fprintf(f, " manualroute");
895#endif
896#ifdef ROUTER_QUERYPROGRAM
897 fprintf(f, " queryprogram");
898#endif
899#ifdef ROUTER_REDIRECT
900 fprintf(f, " redirect");
901#endif
902fprintf(f, "\n");
903
904fprintf(f, "Transports:");
905#ifdef TRANSPORT_APPENDFILE
906 fprintf(f, " appendfile");
907 #ifdef SUPPORT_MAILDIR
908 fprintf(f, "/maildir");
909 #endif
910 #ifdef SUPPORT_MAILSTORE
911 fprintf(f, "/mailstore");
912 #endif
913 #ifdef SUPPORT_MBX
914 fprintf(f, "/mbx");
915 #endif
916#endif
917#ifdef TRANSPORT_AUTOREPLY
918 fprintf(f, " autoreply");
919#endif
920#ifdef TRANSPORT_LMTP
921 fprintf(f, " lmtp");
922#endif
923#ifdef TRANSPORT_PIPE
924 fprintf(f, " pipe");
925#endif
926#ifdef TRANSPORT_SMTP
927 fprintf(f, " smtp");
928#endif
929fprintf(f, "\n");
930
931if (fixed_never_users[0] > 0)
932 {
933 int i;
934 fprintf(f, "Fixed never_users: ");
935 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
936 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
937 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
938 }
21c28500 939
73a46702 940fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
36f12725 941
6545de78
PP
942/* Everything else is details which are only worth reporting when debugging.
943Perhaps the tls_version_report should move into this too. */
944DEBUG(D_any) do {
945
946 int i;
947
b3c261f7
PP
948/* clang defines __GNUC__ (at least, for me) so test for it first */
949#if defined(__clang__)
950 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
951#elif defined(__GNUC__)
952 fprintf(f, "Compiler: GCC [%s]\n",
953# ifdef __VERSION__
954 __VERSION__
955# else
956 "? unknown version ?"
957# endif
958 );
959#else
960 fprintf(f, "Compiler: <unknown>\n");
961#endif
962
754a0503
PP
963#ifdef SUPPORT_TLS
964 tls_version_report(f);
965#endif
966
6545de78
PP
967#ifdef AUTH_CYRUS_SASL
968 auth_cyrus_sasl_version_report(f);
969#endif
970
971 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
972 " Runtime: %s\n",
973 PCRE_MAJOR, PCRE_MINOR,
974 /* PRE_PRERELEASE is either defined and empty or a string.
aa097c4c
NM
975 * unless its an ancient version of PCRE in which case it
976 * is not defined */
977#ifdef PCRE_PRERELEASE
6545de78 978 PCRE_PRERELEASE "",
aa097c4c
NM
979#else
980 "",
981#endif
6545de78
PP
982 pcre_version());
983
984 init_lookup_list();
985 for (i = 0; i < lookup_list_count; i++)
986 {
987 if (lookup_list[i]->version_report)
988 lookup_list[i]->version_report(f);
989 }
990
b70d2586
PP
991#ifdef WHITELIST_D_MACROS
992 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
993#else
994 fprintf(f, "WHITELIST_D_MACROS unset\n");
995#endif
996#ifdef TRUSTED_CONFIG_LIST
997 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
998#else
999 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1000#endif
1001
6545de78 1002} while (0);
059ec3d9
PH
1003}
1004
1005
1006
1007
1008/*************************************************
1009* Quote a local part *
1010*************************************************/
1011
1012/* This function is used when a sender address or a From: or Sender: header
1013line is being created from the caller's login, or from an authenticated_id. It
1014applies appropriate quoting rules for a local part.
1015
1016Argument: the local part
1017Returns: the local part, quoted if necessary
1018*/
1019
1020uschar *
1021local_part_quote(uschar *lpart)
1022{
1023BOOL needs_quote = FALSE;
1024int size, ptr;
1025uschar *yield;
1026uschar *t;
1027
1028for (t = lpart; !needs_quote && *t != 0; t++)
1029 {
1030 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1031 (*t != '.' || t == lpart || t[1] == 0);
1032 }
1033
1034if (!needs_quote) return lpart;
1035
1036size = ptr = 0;
1037yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1038
1039for (;;)
1040 {
1041 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1042 if (nq == NULL)
1043 {
1044 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1045 break;
1046 }
1047 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1048 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1049 yield = string_cat(yield, &size, &ptr, nq, 1);
1050 lpart = nq + 1;
1051 }
1052
1053yield = string_cat(yield, &size, &ptr, US"\"", 1);
1054yield[ptr] = 0;
1055return yield;
1056}
1057
1058
1059
1060#ifdef USE_READLINE
1061/*************************************************
1062* Load readline() functions *
1063*************************************************/
1064
1065/* This function is called from testing executions that read data from stdin,
1066but only when running as the calling user. Currently, only -be does this. The
1067function loads the readline() function library and passes back the functions.
1068On some systems, it needs the curses library, so load that too, but try without
1069it if loading fails. All this functionality has to be requested at build time.
1070
1071Arguments:
1072 fn_readline_ptr pointer to where to put the readline pointer
1073 fn_addhist_ptr pointer to where to put the addhistory function
1074
1075Returns: the dlopen handle or NULL on failure
1076*/
1077
1078static void *
1ba28e2b
PP
1079set_readline(char * (**fn_readline_ptr)(const char *),
1080 void (**fn_addhist_ptr)(const char *))
059ec3d9
PH
1081{
1082void *dlhandle;
1083void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1084
1085dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1086if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1087
1088if (dlhandle != NULL)
1089 {
1ba28e2b
PP
1090 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1091 * char * readline (const char *prompt);
1092 * void add_history (const char *string);
1093 */
1094 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1095 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
059ec3d9
PH
1096 }
1097else
1098 {
1099 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1100 }
1101
1102return dlhandle;
1103}
1104#endif
1105
1106
1107
1108/*************************************************
1109* Get a line from stdin for testing things *
1110*************************************************/
1111
1112/* This function is called when running tests that can take a number of lines
1113of input (for example, -be and -bt). It handles continuations and trailing
1114spaces. And prompting and a blank line output on eof. If readline() is in use,
1115the arguments are non-NULL and provide the relevant functions.
1116
1117Arguments:
1118 fn_readline readline function or NULL
1119 fn_addhist addhist function or NULL
1120
1121Returns: pointer to dynamic memory, or NULL at end of file
1122*/
1123
1124static uschar *
1ba28e2b 1125get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
059ec3d9
PH
1126{
1127int i;
1128int size = 0;
1129int ptr = 0;
1130uschar *yield = NULL;
1131
328895cc 1132if (fn_readline == NULL) { printf("> "); fflush(stdout); }
059ec3d9
PH
1133
1134for (i = 0;; i++)
1135 {
1136 uschar buffer[1024];
1137 uschar *p, *ss;
1138
1139 #ifdef USE_READLINE
1140 char *readline_line = NULL;
1141 if (fn_readline != NULL)
1142 {
1143 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1144 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1145 p = US readline_line;
1146 }
1147 else
1148 #endif
1149
1150 /* readline() not in use */
1151
1152 {
1153 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1154 p = buffer;
1155 }
1156
1157 /* Handle the line */
1158
1159 ss = p + (int)Ustrlen(p);
1160 while (ss > p && isspace(ss[-1])) ss--;
1161
1162 if (i > 0)
1163 {
1164 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1165 }
1166
1167 yield = string_cat(yield, &size, &ptr, p, ss - p);
1168
1169 #ifdef USE_READLINE
1170 if (fn_readline != NULL) free(readline_line);
1171 #endif
1172
1173 if (ss == p || yield[ptr-1] != '\\')
1174 {
1175 yield[ptr] = 0;
1176 break;
1177 }
1178 yield[--ptr] = 0;
1179 }
1180
1181if (yield == NULL) printf("\n");
1182return yield;
1183}
1184
1185
1186
1187/*************************************************
81ea09ca
NM
1188* Output usage information for the program *
1189*************************************************/
1190
1191/* This function is called when there are no recipients
1192 or a specific --help argument was added.
1193
1194Arguments:
1195 progname information on what name we were called by
1196
1197Returns: DOES NOT RETURN
1198*/
1199
1200static void
1201exim_usage(uschar *progname)
1202{
1203
1204/* Handle specific program invocation varients */
1205if (Ustrcmp(progname, US"-mailq") == 0)
1206 {
1207 fprintf(stderr,
e765a0f1 1208 "mailq - list the contents of the mail queue\n\n"
81ea09ca
NM
1209 "For a list of options, see the Exim documentation.\n");
1210 exit(EXIT_FAILURE);
1211 }
1212
1213/* Generic usage - we output this whatever happens */
1214fprintf(stderr,
1215 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1216 "not directly from a shell command line. Options and/or arguments control\n"
1217 "what it does when called. For a list of options, see the Exim documentation.\n");
1218
1219exit(EXIT_FAILURE);
1220}
1221
1222
1223
1224/*************************************************
a7cbbf50
PP
1225* Validate that the macros given are okay *
1226*************************************************/
1227
1228/* Typically, Exim will drop privileges if macros are supplied. In some
1229cases, we want to not do so.
1230
1231Arguments: none (macros is a global)
1232Returns: true if trusted, false otherwise
1233*/
1234
1235static BOOL
1236macros_trusted(void)
1237{
1238#ifdef WHITELIST_D_MACROS
1239macro_item *m;
1240uschar *whitelisted, *end, *p, **whites, **w;
1241int white_count, i, n;
1242size_t len;
1243BOOL prev_char_item, found;
1244#endif
1245
1246if (macros == NULL)
1247 return TRUE;
1248#ifndef WHITELIST_D_MACROS
1249return FALSE;
1250#else
1251
66581d1e
PP
1252/* We only trust -D overrides for some invoking users:
1253root, the exim run-time user, the optional config owner user.
1254I don't know why config-owner would be needed, but since they can own the
1255config files anyway, there's no security risk to letting them override -D. */
1256if ( ! ((real_uid == root_uid)
1257 || (real_uid == exim_uid)
1258#ifdef CONFIGURE_OWNER
1259 || (real_uid == config_uid)
1260#endif
1261 ))
1262 {
1263 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1264 return FALSE;
1265 }
1266
a7cbbf50
PP
1267/* Get a list of macros which are whitelisted */
1268whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1269prev_char_item = FALSE;
1270white_count = 0;
1271for (p = whitelisted; *p != '\0'; ++p)
1272 {
1273 if (*p == ':' || isspace(*p))
1274 {
1275 *p = '\0';
1276 if (prev_char_item)
1277 ++white_count;
1278 prev_char_item = FALSE;
1279 continue;
1280 }
1281 if (!prev_char_item)
1282 prev_char_item = TRUE;
1283 }
1284end = p;
1285if (prev_char_item)
1286 ++white_count;
1287if (!white_count)
1288 return FALSE;
1289whites = store_malloc(sizeof(uschar *) * (white_count+1));
1290for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1291 {
1292 if (*p != '\0')
1293 {
1294 whites[i++] = p;
1295 if (i == white_count)
1296 break;
1297 while (*p != '\0' && p < end)
1298 ++p;
1299 }
1300 }
1301whites[i] = NULL;
1302
1303/* The list of macros should be very short. Accept the N*M complexity. */
1304for (m = macros; m != NULL; m = m->next)
1305 {
1306 found = FALSE;
1307 for (w = whites; *w; ++w)
1308 if (Ustrcmp(*w, m->name) == 0)
1309 {
1310 found = TRUE;
1311 break;
1312 }
1313 if (!found)
1314 return FALSE;
1315 if (m->replacement == NULL)
1316 continue;
1317 len = Ustrlen(m->replacement);
1318 if (len == 0)
1319 continue;
1320 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1321 0, PCRE_EOPT, NULL, 0);
1322 if (n < 0)
1323 {
1324 if (n != PCRE_ERROR_NOMATCH)
1325 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1326 return FALSE;
1327 }
1328 }
43236f35 1329DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
a7cbbf50
PP
1330return TRUE;
1331#endif
1332}
1333
1334
1335/*************************************************
059ec3d9
PH
1336* Entry point and high-level code *
1337*************************************************/
1338
1339/* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1340the appropriate action. All the necessary functions are present in the one
1341binary. I originally thought one should split it up, but it turns out that so
1342much of the apparatus is needed in each chunk that one might as well just have
1343it all available all the time, which then makes the coding easier as well.
1344
1345Arguments:
1346 argc count of entries in argv
1347 argv argument strings, with argv[0] being the program name
1348
1349Returns: EXIT_SUCCESS if terminated successfully
1350 EXIT_FAILURE otherwise, except when a message has been sent
1351 to the sender, and -oee was given
1352*/
1353
1354int
1355main(int argc, char **cargv)
1356{
1357uschar **argv = USS cargv;
1358int arg_receive_timeout = -1;
1359int arg_smtp_receive_timeout = -1;
1360int arg_error_handling = error_handling;
f05da2e8
PH
1361int filter_sfd = -1;
1362int filter_ufd = -1;
059ec3d9 1363int group_count;
1670ef10 1364int i, rv;
059ec3d9
PH
1365int list_queue_option = 0;
1366int msg_action = 0;
1367int msg_action_arg = -1;
1368int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1369int queue_only_reason = 0;
1370#ifdef EXIM_PERL
1371int perl_start_option = 0;
1372#endif
1373int recipients_arg = argc;
1374int sender_address_domain = 0;
1375int test_retry_arg = -1;
1376int test_rewrite_arg = -1;
1377BOOL arg_queue_only = FALSE;
1378BOOL bi_option = FALSE;
1379BOOL checking = FALSE;
1380BOOL count_queue = FALSE;
1381BOOL expansion_test = FALSE;
1382BOOL extract_recipients = FALSE;
1383BOOL forced_delivery = FALSE;
1384BOOL f_end_dot = FALSE;
1385BOOL deliver_give_up = FALSE;
1386BOOL list_queue = FALSE;
1387BOOL list_options = FALSE;
1388BOOL local_queue_only;
1389BOOL more = TRUE;
1390BOOL one_msg_action = FALSE;
1391BOOL queue_only_set = FALSE;
1392BOOL receiving_message = TRUE;
33d73e3b 1393BOOL sender_ident_set = FALSE;
8669f003 1394BOOL session_local_queue_only;
059ec3d9
PH
1395BOOL unprivileged;
1396BOOL removed_privilege = FALSE;
81ea09ca 1397BOOL usage_wanted = FALSE;
059ec3d9
PH
1398BOOL verify_address_mode = FALSE;
1399BOOL verify_as_sender = FALSE;
1400BOOL version_printed = FALSE;
1401uschar *alias_arg = NULL;
1402uschar *called_as = US"";
1403uschar *start_queue_run_id = NULL;
1404uschar *stop_queue_run_id = NULL;
328895cc 1405uschar *expansion_test_message = NULL;
059ec3d9
PH
1406uschar *ftest_domain = NULL;
1407uschar *ftest_localpart = NULL;
1408uschar *ftest_prefix = NULL;
1409uschar *ftest_suffix = NULL;
8544e77a 1410uschar *malware_test_file = NULL;
059ec3d9
PH
1411uschar *real_sender_address;
1412uschar *originator_home = US"/";
059ec3d9
PH
1413void *reset_point;
1414
1415struct passwd *pw;
1416struct stat statbuf;
1417pid_t passed_qr_pid = (pid_t)0;
1418int passed_qr_pipe = -1;
1419gid_t group_list[NGROUPS_MAX];
1420
1421/* Possible options for -R and -S */
1422
1423static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1424
1425/* Need to define this in case we need to change the environment in order
1426to get rid of a bogus time zone. We have to make it char rather than uschar
1427because some OS define it in /usr/include/unistd.h. */
1428
1429extern char **environ;
1430
35edf2ff 1431/* If the Exim user and/or group and/or the configuration file owner/group were
059ec3d9
PH
1432defined by ref:name at build time, we must now find the actual uid/gid values.
1433This is a feature to make the lives of binary distributors easier. */
1434
1435#ifdef EXIM_USERNAME
1436if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1437 {
10385c15
PP
1438 if (exim_uid == 0)
1439 {
1440 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1441 EXIM_USERNAME);
1442 exit(EXIT_FAILURE);
1443 }
084c1d8c
PP
1444 /* If ref:name uses a number as the name, route_finduser() returns
1445 TRUE with exim_uid set and pw coerced to NULL. */
1446 if (pw)
1447 exim_gid = pw->pw_gid;
1448#ifndef EXIM_GROUPNAME
1449 else
1450 {
1451 fprintf(stderr,
1452 "exim: ref:name should specify a usercode, not a group.\n"
1453 "exim: can't let you get away with it unless you also specify a group.\n");
1454 exit(EXIT_FAILURE);
1455 }
1456#endif
059ec3d9
PH
1457 }
1458else
1459 {
1460 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1461 EXIM_USERNAME);
1462 exit(EXIT_FAILURE);
1463 }
1464#endif
1465
1466#ifdef EXIM_GROUPNAME
1467if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1468 {
1469 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1470 EXIM_GROUPNAME);
1471 exit(EXIT_FAILURE);
1472 }
1473#endif
1474
1475#ifdef CONFIGURE_OWNERNAME
1476if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1477 {
1478 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1479 CONFIGURE_OWNERNAME);
1480 exit(EXIT_FAILURE);
1481 }
1482#endif
1483
79d4bc3d
PP
1484/* We default the system_filter_user to be the Exim run-time user, as a
1485sane non-root value. */
1486system_filter_uid = exim_uid;
1487
35edf2ff
PH
1488#ifdef CONFIGURE_GROUPNAME
1489if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1490 {
1491 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1492 CONFIGURE_GROUPNAME);
1493 exit(EXIT_FAILURE);
1494 }
1495#endif
1496
059ec3d9
PH
1497/* In the Cygwin environment, some initialization needs doing. It is fudged
1498in by means of this macro. */
1499
1500#ifdef OS_INIT
1501OS_INIT
1502#endif
1503
1504/* Check a field which is patched when we are running Exim within its
1505testing harness; do a fast initial check, and then the whole thing. */
1506
1507running_in_test_harness =
1508 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1509
1510/* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1511at the start of a program; however, it seems that some environments do not
1512follow this. A "strange" locale can affect the formatting of timestamps, so we
1513make quite sure. */
1514
1515setlocale(LC_ALL, "C");
1516
1517/* Set up the default handler for timing using alarm(). */
1518
1519os_non_restarting_signal(SIGALRM, sigalrm_handler);
1520
1521/* Ensure we have a buffer for constructing log entries. Use malloc directly,
1522because store_malloc writes a log entry on failure. */
1523
1524log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1525if (log_buffer == NULL)
1526 {
1527 fprintf(stderr, "exim: failed to get store for log buffer\n");
1528 exit(EXIT_FAILURE);
1529 }
1530
1531/* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1532NULL when the daemon is run and the file is closed. We have to use this
1533indirection, because some systems don't allow writing to the variable "stderr".
1534*/
1535
1536if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1537
1538/* Arrange for the PCRE regex library to use our store functions. Note that
1539the normal calls are actually macros that add additional arguments for
1540debugging purposes so we have to assign specially constructed functions here.
1541The default is to use store in the stacking pool, but this is overridden in the
1542regex_must_compile() function. */
1543
1544pcre_malloc = function_store_get;
1545pcre_free = function_dummy_free;
1546
1547/* Ensure there is a big buffer for temporary use in several places. It is put
1548in malloc store so that it can be freed for enlargement if necessary. */
1549
1550big_buffer = store_malloc(big_buffer_size);
1551
1552/* Set up the handler for the data request signal, and set the initial
1553descriptive text. */
1554
1555set_process_info("initializing");
1556os_restarting_signal(SIGUSR1, usr1_handler);
1557
1558/* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1559in the daemon code. For the rest of Exim's uses, we ignore it. */
1560
1561signal(SIGHUP, SIG_IGN);
1562
1563/* We don't want to die on pipe errors as the code is written to handle
1564the write error instead. */
1565
1566signal(SIGPIPE, SIG_IGN);
1567
1568/* Under some circumstance on some OS, Exim can get called with SIGCHLD
1569set to SIG_IGN. This causes subprocesses that complete before the parent
1570process waits for them not to hang around, so when Exim calls wait(), nothing
1571is there. The wait() code has been made robust against this, but let's ensure
1572that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1573ending status. We use sigaction rather than plain signal() on those OS where
1574SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1575problem on AIX with this.) */
1576
1577#ifdef SA_NOCLDWAIT
1578 {
1579 struct sigaction act;
1580 act.sa_handler = SIG_DFL;
1581 sigemptyset(&(act.sa_mask));
1582 act.sa_flags = 0;
1583 sigaction(SIGCHLD, &act, NULL);
1584 }
1585#else
1586signal(SIGCHLD, SIG_DFL);
1587#endif
1588
1589/* Save the arguments for use if we re-exec exim as a daemon after receiving
1590SIGHUP. */
1591
1592sighup_argv = argv;
1593
1594/* Set up the version number. Set up the leading 'E' for the external form of
1595message ids, set the pointer to the internal form, and initialize it to
1596indicate no message being processed. */
1597
1598version_init();
1599message_id_option[0] = '-';
1600message_id_external = message_id_option + 1;
1601message_id_external[0] = 'E';
1602message_id = message_id_external + 1;
1603message_id[0] = 0;
1604
67d175de 1605/* Set the umask to zero so that any files Exim creates using open() are
2632889e
PH
1606created with the modes that it specifies. NOTE: Files created with fopen() have
1607a problem, which was not recognized till rather late (February 2006). With this
1608umask, such files will be world writeable. (They are all content scanning files
1609in the spool directory, which isn't world-accessible, so this is not a
1610disaster, but it's untidy.) I don't want to change this overall setting,
1611however, because it will interact badly with the open() calls. Instead, there's
1612now a function called modefopen() that fiddles with the umask while calling
1613fopen(). */
059ec3d9 1614
67d175de 1615(void)umask(0);
059ec3d9
PH
1616
1617/* Precompile the regular expression for matching a message id. Keep this in
1618step with the code that generates ids in the accept.c module. We need to do
1619this here, because the -M options check their arguments for syntactic validity
1620using mac_ismsgid, which uses this. */
1621
1622regex_ismsgid =
1623 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1624
a5bd321b 1625/* Precompile the regular expression that is used for matching an SMTP error
d6a96edc
PH
1626code, possibly extended, at the start of an error message. Note that the
1627terminating whitespace character is included. */
a5bd321b
PH
1628
1629regex_smtp_code =
1630 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1631 FALSE, TRUE);
1632
a7cbbf50
PP
1633#ifdef WHITELIST_D_MACROS
1634/* Precompile the regular expression used to filter the content of macros
1635given to -D for permissibility. */
1636
1637regex_whitelisted_macro =
1638 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1639#endif
1640
1641
059ec3d9
PH
1642/* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1643this seems to be a generally accepted convention, since one finds symbolic
1644links called "mailq" in standard OS configurations. */
1645
1646if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1647 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1648 {
1649 list_queue = TRUE;
1650 receiving_message = FALSE;
1651 called_as = US"-mailq";
1652 }
1653
1654/* If the program is called as "rmail" treat it as equivalent to
1655"exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1656i.e. preventing a single dot on a line from terminating the message, and
1657returning with zero return code, even in cases of error (provided an error
1658message has been sent). */
1659
1660if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1661 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1662 {
1663 dot_ends = FALSE;
1664 called_as = US"-rmail";
1665 errors_sender_rc = EXIT_SUCCESS;
1666 }
1667
1668/* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1669this is a smail convention. */
1670
1671if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1672 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1673 {
1674 smtp_input = smtp_batched_input = TRUE;
1675 called_as = US"-rsmtp";
1676 }
1677
1678/* If the program is called as "runq" treat it as equivalent to "exim -q";
1679this is a smail convention. */
1680
1681if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1682 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1683 {
1684 queue_interval = 0;
1685 receiving_message = FALSE;
1686 called_as = US"-runq";
1687 }
1688
1689/* If the program is called as "newaliases" treat it as equivalent to
1690"exim -bi"; this is a sendmail convention. */
1691
1692if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1693 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1694 {
1695 bi_option = TRUE;
1696 receiving_message = FALSE;
1697 called_as = US"-newaliases";
1698 }
1699
1700/* Save the original effective uid for a couple of uses later. It should
1701normally be root, but in some esoteric environments it may not be. */
1702
1703original_euid = geteuid();
1704
1705/* Get the real uid and gid. If the caller is root, force the effective uid/gid
1706to be the same as the real ones. This makes a difference only if Exim is setuid
1707(or setgid) to something other than root, which could be the case in some
1708special configurations. */
1709
1710real_uid = getuid();
1711real_gid = getgid();
1712
1713if (real_uid == root_uid)
1714 {
1670ef10
PP
1715 rv = setgid(real_gid);
1716 if (rv)
1717 {
1718 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1719 (long int)real_gid, strerror(errno));
1720 exit(EXIT_FAILURE);
1721 }
1722 rv = setuid(real_uid);
1723 if (rv)
1724 {
1725 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1726 (long int)real_uid, strerror(errno));
1727 exit(EXIT_FAILURE);
1728 }
059ec3d9
PH
1729 }
1730
1731/* If neither the original real uid nor the original euid was root, Exim is
1732running in an unprivileged state. */
1733
1734unprivileged = (real_uid != root_uid && original_euid != root_uid);
1735
059ec3d9
PH
1736/* Scan the program's arguments. Some can be dealt with right away; others are
1737simply recorded for checking and handling afterwards. Do a high-level switch
1738on the second character (the one after '-'), to save some effort. */
1739
1740for (i = 1; i < argc; i++)
1741 {
1742 BOOL badarg = FALSE;
1743 uschar *arg = argv[i];
1744 uschar *argrest;
1745 int switchchar;
1746
1747 /* An argument not starting with '-' is the start of a recipients list;
1748 break out of the options-scanning loop. */
1749
1750 if (arg[0] != '-')
1751 {
1752 recipients_arg = i;
1753 break;
1754 }
1755
1756 /* An option consistion of -- terminates the options */
1757
1758 if (Ustrcmp(arg, "--") == 0)
1759 {
1760 recipients_arg = i + 1;
1761 break;
1762 }
1763
1764 /* Handle flagged options */
1765
1766 switchchar = arg[1];
1767 argrest = arg+2;
1768
1769 /* Make all -ex options synonymous with -oex arguments, since that
1770 is assumed by various callers. Also make -qR options synonymous with -R
1771 options, as that seems to be required as well. Allow for -qqR too, and
1772 the same for -S options. */
1773
1774 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1775 Ustrncmp(arg+1, "qR", 2) == 0 ||
1776 Ustrncmp(arg+1, "qS", 2) == 0)
1777 {
1778 switchchar = arg[2];
1779 argrest++;
1780 }
1781 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1782 {
1783 switchchar = arg[3];
1784 argrest += 2;
1785 queue_2stage = TRUE;
1786 }
1787
1788 /* Make -r synonymous with -f, since it is a documented alias */
1789
1790 else if (arg[1] == 'r') switchchar = 'f';
1791
1792 /* Make -ov synonymous with -v */
1793
1794 else if (Ustrcmp(arg, "-ov") == 0)
1795 {
1796 switchchar = 'v';
1797 argrest++;
1798 }
1799
4b2241d2
PP
1800 /* deal with --option_aliases */
1801 else if (switchchar == '-')
1802 {
1803 if (Ustrcmp(argrest, "help") == 0)
1804 {
1805 usage_wanted = TRUE;
1806 break;
1807 }
1808 else if (Ustrcmp(argrest, "version") == 0)
1809 {
1810 switchchar = 'b';
73a46702 1811 argrest = US"V";
4b2241d2
PP
1812 }
1813 }
1814
059ec3d9
PH
1815 /* High-level switch on active initial letter */
1816
1817 switch(switchchar)
1818 {
1819 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1820 so has no need of it. */
1821
1822 case 'B':
1823 if (*argrest == 0) i++; /* Skip over the type */
1824 break;
1825
1826
1827 case 'b':
1828 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1829
1830 /* -bd: Run in daemon mode, awaiting SMTP connections.
1831 -bdf: Ditto, but in the foreground.
1832 */
1833
1834 if (*argrest == 'd')
1835 {
1836 daemon_listen = TRUE;
1837 if (*(++argrest) == 'f') background_daemon = FALSE;
1838 else if (*argrest != 0) { badarg = TRUE; break; }
1839 }
1840
328895cc
PH
1841 /* -be: Run in expansion test mode
1842 -bem: Ditto, but read a message from a file first
1843 */
059ec3d9
PH
1844
1845 else if (*argrest == 'e')
328895cc 1846 {
059ec3d9 1847 expansion_test = checking = TRUE;
328895cc
PH
1848 if (argrest[1] == 'm')
1849 {
1850 if (++i >= argc) { badarg = TRUE; break; }
1851 expansion_test_message = argv[i];
1852 argrest++;
1853 }
1854 if (argrest[1] != 0) { badarg = TRUE; break; }
1855 }
059ec3d9 1856
f05da2e8
PH
1857 /* -bF: Run system filter test */
1858
1859 else if (*argrest == 'F')
1860 {
1861 filter_test |= FTEST_SYSTEM;
1862 if (*(++argrest) != 0) { badarg = TRUE; break; }
1863 if (++i < argc) filter_test_sfile = argv[i]; else
1864 {
1865 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1866 exit(EXIT_FAILURE);
1867 }
1868 }
1869
1870 /* -bf: Run user filter test
059ec3d9
PH
1871 -bfd: Set domain for filter testing
1872 -bfl: Set local part for filter testing
1873 -bfp: Set prefix for filter testing
1874 -bfs: Set suffix for filter testing
1875 */
1876
f05da2e8 1877 else if (*argrest == 'f')
059ec3d9 1878 {
f05da2e8 1879 if (*(++argrest) == 0)
059ec3d9 1880 {
f05da2e8
PH
1881 filter_test |= FTEST_USER;
1882 if (++i < argc) filter_test_ufile = argv[i]; else
059ec3d9
PH
1883 {
1884 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1885 exit(EXIT_FAILURE);
1886 }
1887 }
1888 else
1889 {
1890 if (++i >= argc)
1891 {
1892 fprintf(stderr, "exim: string expected after %s\n", arg);
1893 exit(EXIT_FAILURE);
1894 }
1895 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1896 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1897 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1898 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1899 else { badarg = TRUE; break; }
1900 }
1901 }
1902
1903 /* -bh: Host checking - an IP address must follow. */
1904
1905 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1906 {
1907 if (++i >= argc) { badarg = TRUE; break; }
1908 sender_host_address = argv[i];
1909 host_checking = checking = log_testing_mode = TRUE;
1910 host_checking_callout = argrest[1] == 'c';
1911 }
1912
1913 /* -bi: This option is used by sendmail to initialize *the* alias file,
1914 though it has the -oA option to specify a different file. Exim has no
1915 concept of *the* alias file, but since Sun's YP make script calls
1916 sendmail this way, some support must be provided. */
1917
1918 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1919
1920 /* -bm: Accept and deliver message - the default option. Reinstate
1921 receiving_message, which got turned off for all -b options. */
1922
1923 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1924
8544e77a
PP
1925 /* -bmalware: test the filename given for malware */
1926
1927 else if (Ustrcmp(argrest, "malware") == 0)
1928 {
1929 if (++i >= argc) { badarg = TRUE; break; }
1930 malware_test_file = argv[i];
1931 }
1932
059ec3d9
PH
1933 /* -bnq: For locally originating messages, do not qualify unqualified
1934 addresses. In the envelope, this causes errors; in header lines they
1935 just get left. */
1936
1937 else if (Ustrcmp(argrest, "nq") == 0)
1938 {
1939 allow_unqualified_sender = FALSE;
1940 allow_unqualified_recipient = FALSE;
1941 }
1942
1943 /* -bpxx: List the contents of the mail queue, in various forms. If
1944 the option is -bpc, just a queue count is needed. Otherwise, if the
1945 first letter after p is r, then order is random. */
1946
1947 else if (*argrest == 'p')
1948 {
1949 if (*(++argrest) == 'c')
1950 {
1951 count_queue = TRUE;
1952 if (*(++argrest) != 0) badarg = TRUE;
1953 break;
1954 }
1955
1956 if (*argrest == 'r')
1957 {
1958 list_queue_option = 8;
1959 argrest++;
1960 }
1961 else list_queue_option = 0;
1962
1963 list_queue = TRUE;
1964
1965 /* -bp: List the contents of the mail queue, top-level only */
1966
1967 if (*argrest == 0) {}
1968
1969 /* -bpu: List the contents of the mail queue, top-level undelivered */
1970
1971 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1972
1973 /* -bpa: List the contents of the mail queue, including all delivered */
1974
1975 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1976
1977 /* Unknown after -bp[r] */
1978
1979 else
1980 {
1981 badarg = TRUE;
1982 break;
1983 }
1984 }
1985
1986
1987 /* -bP: List the configuration variables given as the address list.
1988 Force -v, so configuration errors get displayed. */
1989
1990 else if (Ustrcmp(argrest, "P") == 0)
1991 {
1992 list_options = TRUE;
1993 debug_selector |= D_v;
1994 debug_file = stderr;
1995 }
1996
1997 /* -brt: Test retry configuration lookup */
1998
1999 else if (Ustrcmp(argrest, "rt") == 0)
2000 {
2001 test_retry_arg = i + 1;
2002 goto END_ARG;
2003 }
2004
2005 /* -brw: Test rewrite configuration */
2006
2007 else if (Ustrcmp(argrest, "rw") == 0)
2008 {
2009 test_rewrite_arg = i + 1;
2010 goto END_ARG;
2011 }
2012
2013 /* -bS: Read SMTP commands on standard input, but produce no replies -
2014 all errors are reported by sending messages. */
2015
2016 else if (Ustrcmp(argrest, "S") == 0)
2017 smtp_input = smtp_batched_input = receiving_message = TRUE;
2018
2019 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2020 on standard output. */
2021
2022 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2023
2024 /* -bt: address testing mode */
2025
2026 else if (Ustrcmp(argrest, "t") == 0)
2027 address_test_mode = checking = log_testing_mode = TRUE;
2028
2029 /* -bv: verify addresses */
2030
2031 else if (Ustrcmp(argrest, "v") == 0)
2032 verify_address_mode = checking = log_testing_mode = TRUE;
2033
2034 /* -bvs: verify sender addresses */
2035
2036 else if (Ustrcmp(argrest, "vs") == 0)
2037 {
2038 verify_address_mode = checking = log_testing_mode = TRUE;
2039 verify_as_sender = TRUE;
2040 }
2041
2042 /* -bV: Print version string and support details */
2043
2044 else if (Ustrcmp(argrest, "V") == 0)
2045 {
2046 printf("Exim version %s #%s built %s\n", version_string,
2047 version_cnumber, version_date);
2048 printf("%s\n", CS version_copyright);
2049 version_printed = TRUE;
2050 show_whats_supported(stdout);
2051 }
2052
2053 else badarg = TRUE;
2054 break;
2055
2056
2057 /* -C: change configuration file list; ignore if it isn't really
2058 a change! Enforce a prefix check if required. */
2059
2060 case 'C':
2061 if (*argrest == 0)
2062 {
2063 if(++i < argc) argrest = argv[i]; else
2064 { badarg = TRUE; break; }
2065 }
2066 if (Ustrcmp(config_main_filelist, argrest) != 0)
2067 {
2068 #ifdef ALT_CONFIG_PREFIX
2069 int sep = 0;
2070 int len = Ustrlen(ALT_CONFIG_PREFIX);
2071 uschar *list = argrest;
2072 uschar *filename;
2073 while((filename = string_nextinlist(&list, &sep, big_buffer,
2074 big_buffer_size)) != NULL)
2075 {
2076 if ((Ustrlen(filename) < len ||
2077 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2078 Ustrstr(filename, "/../") != NULL) &&
2079 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2080 {
2081 fprintf(stderr, "-C Permission denied\n");
2082 exit(EXIT_FAILURE);
2083 }
2084 }
2085 #endif
261dc43e
DW
2086 if (real_uid != root_uid)
2087 {
90b6341f 2088 #ifdef TRUSTED_CONFIG_LIST
261dc43e 2089
90b6341f
DW
2090 if (real_uid != exim_uid
2091 #ifdef CONFIGURE_OWNER
2092 && real_uid != config_uid
2093 #endif
2094 )
261dc43e
DW
2095 trusted_config = FALSE;
2096 else
2097 {
90b6341f 2098 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
261dc43e
DW
2099 if (trust_list)
2100 {
2101 struct stat statbuf;
2102
2103 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2104 (statbuf.st_uid != root_uid /* owner not root */
2105 #ifdef CONFIGURE_OWNER
2106 && statbuf.st_uid != config_uid /* owner not the special one */
2107 #endif
2108 ) || /* or */
2109 (statbuf.st_gid != root_gid /* group not root */
2110 #ifdef CONFIGURE_GROUP
2111 && statbuf.st_gid != config_gid /* group not the special one */
2112 #endif
2113 && (statbuf.st_mode & 020) != 0 /* group writeable */
2114 ) || /* or */
2115 (statbuf.st_mode & 2) != 0) /* world writeable */
2116 {
2117 trusted_config = FALSE;
2118 fclose(trust_list);
2119 }
2120 else
2121 {
2122 /* Well, the trust list at least is up to scratch... */
2123 void *reset_point = store_get(0);
90b6341f
DW
2124 uschar *trusted_configs[32];
2125 int nr_configs = 0;
261dc43e
DW
2126 int i = 0;
2127
2128 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2129 {
2130 uschar *start = big_buffer, *nl;
2131 while (*start && isspace(*start))
2132 start++;
1e83d68b 2133 if (*start != '/')
261dc43e
DW
2134 continue;
2135 nl = Ustrchr(start, '\n');
2136 if (nl)
2137 *nl = 0;
90b6341f
DW
2138 trusted_configs[nr_configs++] = string_copy(start);
2139 if (nr_configs == 32)
261dc43e
DW
2140 break;
2141 }
2142 fclose(trust_list);
2143
90b6341f 2144 if (nr_configs)
261dc43e
DW
2145 {
2146 int sep = 0;
2147 uschar *list = argrest;
2148 uschar *filename;
2149 while (trusted_config && (filename = string_nextinlist(&list,
2150 &sep, big_buffer, big_buffer_size)) != NULL)
2151 {
90b6341f 2152 for (i=0; i < nr_configs; i++)
261dc43e 2153 {
90b6341f 2154 if (Ustrcmp(filename, trusted_configs[i]) == 0)
261dc43e
DW
2155 break;
2156 }
90b6341f 2157 if (i == nr_configs)
261dc43e
DW
2158 {
2159 trusted_config = FALSE;
2160 break;
2161 }
2162 }
1e83d68b 2163 store_reset(reset_point);
261dc43e
DW
2164 }
2165 else
2166 {
2167 /* No valid prefixes found in trust_list file. */
2168 trusted_config = FALSE;
2169 }
2170 }
2171 }
2172 else
2173 {
2174 /* Could not open trust_list file. */
2175 trusted_config = FALSE;
2176 }
2177 }
2178 #else
2179 /* Not root; don't trust config */
2180 trusted_config = FALSE;
2181 #endif
2182 }
059ec3d9
PH
2183
2184 config_main_filelist = argrest;
2185 config_changed = TRUE;
2186 }
2187 break;
2188
2189
2190 /* -D: set up a macro definition */
2191
2192 case 'D':
2193 #ifdef DISABLE_D_OPTION
2194 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2195 exit(EXIT_FAILURE);
2196 #else
2197 {
2198 int ptr = 0;
2199 macro_item *mlast = NULL;
2200 macro_item *m;
2201 uschar name[24];
2202 uschar *s = argrest;
2203
2204 while (isspace(*s)) s++;
2205
2206 if (*s < 'A' || *s > 'Z')
2207 {
2208 fprintf(stderr, "exim: macro name set by -D must start with "
2209 "an upper case letter\n");
2210 exit(EXIT_FAILURE);
2211 }
2212
2213 while (isalnum(*s) || *s == '_')
2214 {
2215 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2216 s++;
2217 }
2218 name[ptr] = 0;
2219 if (ptr == 0) { badarg = TRUE; break; }
2220 while (isspace(*s)) s++;
2221 if (*s != 0)
2222 {
2223 if (*s++ != '=') { badarg = TRUE; break; }
2224 while (isspace(*s)) s++;
2225 }
2226
2227 for (m = macros; m != NULL; m = m->next)
2228 {
2229 if (Ustrcmp(m->name, name) == 0)
2230 {
2231 fprintf(stderr, "exim: duplicated -D in command line\n");
2232 exit(EXIT_FAILURE);
2233 }
2234 mlast = m;
2235 }
2236
2237 m = store_get(sizeof(macro_item) + Ustrlen(name));
2238 m->next = NULL;
2239 m->command_line = TRUE;
2240 if (mlast == NULL) macros = m; else mlast->next = m;
2241 Ustrcpy(m->name, name);
2242 m->replacement = string_copy(s);
2243
2244 if (clmacro_count >= MAX_CLMACROS)
2245 {
2246 fprintf(stderr, "exim: too many -D options on command line\n");
2247 exit(EXIT_FAILURE);
2248 }
2249 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2250 m->replacement);
2251 }
2252 #endif
2253 break;
2254
2255 /* -d: Set debug level (see also -v below) or set the drop_cr option.
8e669ac1 2256 The latter is now a no-op, retained for compatibility only. If -dd is used,
3d235903 2257 debugging subprocesses of the daemon is disabled. */
059ec3d9
PH
2258
2259 case 'd':
2260 if (Ustrcmp(argrest, "ropcr") == 0)
2261 {
2262 /* drop_cr = TRUE; */
2263 }
2264
2265 /* Use an intermediate variable so that we don't set debugging while
2266 decoding the debugging bits. */
2267
2268 else
2269 {
2270 unsigned int selector = D_default;
2271 debug_selector = 0;
2272 debug_file = NULL;
3d235903
PH
2273 if (*argrest == 'd')
2274 {
2275 debug_daemon = TRUE;
2276 argrest++;
2277 }
059ec3d9 2278 if (*argrest != 0)
1fe64dcc 2279 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
ed7f7860 2280 debug_options_count, US"debug", 0);
059ec3d9
PH
2281 debug_selector = selector;
2282 }
2283 break;
2284
2285
2286 /* -E: This is a local error message. This option is not intended for
2287 external use at all, but is not restricted to trusted callers because it
2288 does no harm (just suppresses certain error messages) and if Exim is run
2289 not setuid root it won't always be trusted when it generates error
2290 messages using this option. If there is a message id following -E, point
2291 message_reference at it, for logging. */
2292
2293 case 'E':
2294 local_error_message = TRUE;
2295 if (mac_ismsgid(argrest)) message_reference = argrest;
2296 break;
2297
2298
2299 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2300 option, so it looks as if historically the -oex options are also callable
2301 without the leading -o. So we have to accept them. Before the switch,
2302 anything starting -oe has been converted to -e. Exim does not support all
2303 of the sendmail error options. */
2304
2305 case 'e':
2306 if (Ustrcmp(argrest, "e") == 0)
2307 {
2308 arg_error_handling = ERRORS_SENDER;
2309 errors_sender_rc = EXIT_SUCCESS;
2310 }
2311 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2312 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2313 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2314 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2315 else badarg = TRUE;
2316 break;
2317
2318
2319 /* -F: Set sender's full name, used instead of the gecos entry from
2320 the password file. Since users can usually alter their gecos entries,
2321 there's no security involved in using this instead. The data can follow
2322 the -F or be in the next argument. */
2323
2324 case 'F':
2325 if (*argrest == 0)
2326 {
2327 if(++i < argc) argrest = argv[i]; else
2328 { badarg = TRUE; break; }
2329 }
2330 originator_name = argrest;
2fe1a124 2331 sender_name_forced = TRUE;
059ec3d9
PH
2332 break;
2333
2334
2335 /* -f: Set sender's address - this value is only actually used if Exim is
2336 run by a trusted user, or if untrusted_set_sender is set and matches the
2337 address, except that the null address can always be set by any user. The
2338 test for this happens later, when the value given here is ignored when not
2339 permitted. For an untrusted user, the actual sender is still put in Sender:
2340 if it doesn't match the From: header (unless no_local_from_check is set).
2341 The data can follow the -f or be in the next argument. The -r switch is an
2342 obsolete form of -f but since there appear to be programs out there that
2343 use anything that sendmail has ever supported, better accept it - the
2344 synonymizing is done before the switch above.
2345
2346 At this stage, we must allow domain literal addresses, because we don't
2347 know what the setting of allow_domain_literals is yet. Ditto for trailing
2348 dots and strip_trailing_dot. */
2349
2350 case 'f':
2351 {
2352 int start, end;
2353 uschar *errmess;
2354 if (*argrest == 0)
2355 {
2356 if (i+1 < argc) argrest = argv[++i]; else
2357 { badarg = TRUE; break; }
2358 }
2359 if (*argrest == 0)
2360 {
2361 sender_address = string_sprintf(""); /* Ensure writeable memory */
2362 }
2363 else
2364 {
2365 uschar *temp = argrest + Ustrlen(argrest) - 1;
2366 while (temp >= argrest && isspace(*temp)) temp--;
2367 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2368 allow_domain_literals = TRUE;
2369 strip_trailing_dot = TRUE;
2370 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2371 &sender_address_domain, TRUE);
2372 allow_domain_literals = FALSE;
2373 strip_trailing_dot = FALSE;
2374 if (sender_address == NULL)
2375 {
2376 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2377 return EXIT_FAILURE;
2378 }
2379 }
2380 sender_address_forced = TRUE;
2381 }
2382 break;
2383
2384 /* This is some Sendmail thing which can be ignored */
2385
2386 case 'G':
2387 break;
2388
2389 /* -h: Set the hop count for an incoming message. Exim does not currently
2390 support this; it always computes it by counting the Received: headers.
2391 To put it in will require a change to the spool header file format. */
2392
2393 case 'h':
2394 if (*argrest == 0)
2395 {
2396 if(++i < argc) argrest = argv[i]; else
2397 { badarg = TRUE; break; }
2398 }
2399 if (!isdigit(*argrest)) badarg = TRUE;
2400 break;
2401
2402
2403 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2404 not to be documented for sendmail but mailx (at least) uses it) */
2405
2406 case 'i':
2407 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2408 break;
2409
2410
2411 case 'M':
2412 receiving_message = FALSE;
2413
2414 /* -MC: continue delivery of another message via an existing open
2415 file descriptor. This option is used for an internal call by the
2416 smtp transport when there is a pending message waiting to go to an
2417 address to which it has got a connection. Five subsequent arguments are
2418 required: transport name, host name, IP address, sequence number, and
2419 message_id. Transports may decline to create new processes if the sequence
2420 number gets too big. The channel is stdin. This (-MC) must be the last
2421 argument. There's a subsequent check that the real-uid is privileged.
2422
2423 If we are running in the test harness. delay for a bit, to let the process
2424 that set this one up complete. This makes for repeatability of the logging,
2425 etc. output. */
2426
2427 if (Ustrcmp(argrest, "C") == 0)
2428 {
41c7c167
PH
2429 union sockaddr_46 interface_sock;
2430 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2431
059ec3d9
PH
2432 if (argc != i + 6)
2433 {
2434 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2435 return EXIT_FAILURE;
2436 }
2437
2438 if (msg_action_arg >= 0)
2439 {
2440 fprintf(stderr, "exim: incompatible arguments\n");
2441 return EXIT_FAILURE;
2442 }
2443
2444 continue_transport = argv[++i];
2445 continue_hostname = argv[++i];
2446 continue_host_address = argv[++i];
2447 continue_sequence = Uatoi(argv[++i]);
2448 msg_action = MSG_DELIVER;
2449 msg_action_arg = ++i;
2450 forced_delivery = TRUE;
2451 queue_run_pid = passed_qr_pid;
2452 queue_run_pipe = passed_qr_pipe;
2453
2454 if (!mac_ismsgid(argv[i]))
2455 {
2456 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2457 argv[i]);
2458 return EXIT_FAILURE;
2459 }
2460
41c7c167
PH
2461 /* Set up $sending_ip_address and $sending_port */
2462
2463 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2464 &size) == 0)
2465 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2466 &sending_port);
2467 else
2468 {
2469 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2470 strerror(errno));
2471 return EXIT_FAILURE;
2472 }
2473
059ec3d9
PH
2474 if (running_in_test_harness) millisleep(500);
2475 break;
2476 }
2477
2478 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2479 precedes -MC (see above). The flag indicates that the host to which
2480 Exim is connected has accepted an AUTH sequence. */
2481
2482 else if (Ustrcmp(argrest, "CA") == 0)
2483 {
2484 smtp_authenticated = TRUE;
2485 break;
2486 }
2487
2488 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2489 it preceded -MC (see above) */
2490
2491 else if (Ustrcmp(argrest, "CP") == 0)
2492 {
2493 smtp_use_pipelining = TRUE;
2494 break;
2495 }
2496
2497 /* -MCQ: pass on the pid of the queue-running process that started
2498 this chain of deliveries and the fd of its synchronizing pipe; this
2499 is useful only when it precedes -MC (see above) */
2500
2501 else if (Ustrcmp(argrest, "CQ") == 0)
2502 {
2503 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2504 else badarg = TRUE;
2505 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2506 else badarg = TRUE;
2507 break;
2508 }
2509
2510 /* -MCS: set the smtp_use_size flag; this is useful only when it
2511 precedes -MC (see above) */
2512
2513 else if (Ustrcmp(argrest, "CS") == 0)
2514 {
2515 smtp_use_size = TRUE;
2516 break;
2517 }
2518
2519 /* -MCT: set the tls_offered flag; this is useful only when it
2520 precedes -MC (see above). The flag indicates that the host to which
2521 Exim is connected has offered TLS support. */
2522
2523 #ifdef SUPPORT_TLS
2524 else if (Ustrcmp(argrest, "CT") == 0)
2525 {
2526 tls_offered = TRUE;
2527 break;
2528 }
2529 #endif
2530
2531 /* -M[x]: various operations on the following list of message ids:
2532 -M deliver the messages, ignoring next retry times and thawing
2533 -Mc deliver the messages, checking next retry times, no thawing
2534 -Mf freeze the messages
2535 -Mg give up on the messages
2536 -Mt thaw the messages
2537 -Mrm remove the messages
2538 In the above cases, this must be the last option. There are also the
2539 following options which are followed by a single message id, and which
2540 act on that message. Some of them use the "recipient" addresses as well.
2541 -Mar add recipient(s)
2542 -Mmad mark all recipients delivered
2543 -Mmd mark recipients(s) delivered
2544 -Mes edit sender
0ef732d9 2545 -Mset load a message for use with -be
059ec3d9 2546 -Mvb show body
a96603a0 2547 -Mvc show copy (of whole message, in RFC 2822 format)
059ec3d9
PH
2548 -Mvh show header
2549 -Mvl show log
2550 */
2551
2552 else if (*argrest == 0)
2553 {
2554 msg_action = MSG_DELIVER;
2555 forced_delivery = deliver_force_thaw = TRUE;
2556 }
2557 else if (Ustrcmp(argrest, "ar") == 0)
2558 {
2559 msg_action = MSG_ADD_RECIPIENT;
2560 one_msg_action = TRUE;
2561 }
2562 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2563 else if (Ustrcmp(argrest, "es") == 0)
2564 {
2565 msg_action = MSG_EDIT_SENDER;
2566 one_msg_action = TRUE;
2567 }
2568 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2569 else if (Ustrcmp(argrest, "g") == 0)
2570 {
2571 msg_action = MSG_DELIVER;
2572 deliver_give_up = TRUE;
2573 }
2574 else if (Ustrcmp(argrest, "mad") == 0)
2575 {
2576 msg_action = MSG_MARK_ALL_DELIVERED;
2577 }
2578 else if (Ustrcmp(argrest, "md") == 0)
2579 {
2580 msg_action = MSG_MARK_DELIVERED;
2581 one_msg_action = TRUE;
2582 }
2583 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
0ef732d9
PH
2584 else if (Ustrcmp(argrest, "set") == 0)
2585 {
2586 msg_action = MSG_LOAD;
2587 one_msg_action = TRUE;
2588 }
059ec3d9
PH
2589 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2590 else if (Ustrcmp(argrest, "vb") == 0)
2591 {
2592 msg_action = MSG_SHOW_BODY;
2593 one_msg_action = TRUE;
2594 }
a96603a0
PH
2595 else if (Ustrcmp(argrest, "vc") == 0)
2596 {
2597 msg_action = MSG_SHOW_COPY;
2598 one_msg_action = TRUE;
2599 }
059ec3d9
PH
2600 else if (Ustrcmp(argrest, "vh") == 0)
2601 {
2602 msg_action = MSG_SHOW_HEADER;
2603 one_msg_action = TRUE;
2604 }
2605 else if (Ustrcmp(argrest, "vl") == 0)
2606 {
2607 msg_action = MSG_SHOW_LOG;
2608 one_msg_action = TRUE;
2609 }
2610 else { badarg = TRUE; break; }
2611
2612 /* All the -Mxx options require at least one message id. */
2613
2614 msg_action_arg = i + 1;
2615 if (msg_action_arg >= argc)
2616 {
2617 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2618 return EXIT_FAILURE;
2619 }
2620
2621 /* Some require only message ids to follow */
2622
2623 if (!one_msg_action)
2624 {
2625 int j;
2626 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2627 {
2628 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2629 argv[j], arg);
2630 return EXIT_FAILURE;
2631 }
2632 goto END_ARG; /* Remaining args are ids */
2633 }
2634
2635 /* Others require only one message id, possibly followed by addresses,
2636 which will be handled as normal arguments. */
2637
2638 else
2639 {
2640 if (!mac_ismsgid(argv[msg_action_arg]))
2641 {
2642 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2643 argv[msg_action_arg], arg);
2644 return EXIT_FAILURE;
2645 }
2646 i++;
2647 }
2648 break;
2649
2650
2651 /* Some programs seem to call the -om option without the leading o;
2652 for sendmail it askes for "me too". Exim always does this. */
2653
2654 case 'm':
2655 if (*argrest != 0) badarg = TRUE;
2656 break;
2657
2658
2659 /* -N: don't do delivery - a debugging option that stops transports doing
2660 their thing. It implies debugging at the D_v level. */
2661
2662 case 'N':
2663 if (*argrest == 0)
2664 {
2665 dont_deliver = TRUE;
2666 debug_selector |= D_v;
2667 debug_file = stderr;
2668 }
2669 else badarg = TRUE;
2670 break;
2671
2672
2673 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2674 it. */
2675
2676 case 'n':
2677 break;
2678
2679 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2680 option to the specified value. This form uses long names. We need to handle
2681 -O option=value and -Ooption=value. */
2682
2683 case 'O':
2684 if (*argrest == 0)
2685 {
2686 if (++i >= argc)
2687 {
2688 fprintf(stderr, "exim: string expected after -O\n");
2689 exit(EXIT_FAILURE);
2690 }
2691 }
2692 break;
2693
2694 case 'o':
2695
2696 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2697 file" option). */
2698
2699 if (*argrest == 'A')
2700 {
2701 alias_arg = argrest + 1;
2702 if (alias_arg[0] == 0)
2703 {
2704 if (i+1 < argc) alias_arg = argv[++i]; else
2705 {
2706 fprintf(stderr, "exim: string expected after -oA\n");
2707 exit(EXIT_FAILURE);
2708 }
2709 }
2710 }
2711
2712 /* -oB: Set a connection message max value for remote deliveries */
2713
2714 else if (*argrest == 'B')
2715 {
2716 uschar *p = argrest + 1;
2717 if (p[0] == 0)
2718 {
2719 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2720 {
2721 connection_max_messages = 1;
2722 p = NULL;
2723 }
2724 }
2725
2726 if (p != NULL)
2727 {
2728 if (!isdigit(*p))
2729 {
2730 fprintf(stderr, "exim: number expected after -oB\n");
2731 exit(EXIT_FAILURE);
2732 }
2733 connection_max_messages = Uatoi(p);
2734 }
2735 }
2736
2737 /* -odb: background delivery */
2738
2739 else if (Ustrcmp(argrest, "db") == 0)
2740 {
2741 synchronous_delivery = FALSE;
2742 arg_queue_only = FALSE;
2743 queue_only_set = TRUE;
2744 }
2745
2746 /* -odf: foreground delivery (smail-compatible option); same effect as
2747 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2748 */
2749
2750 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2751 {
2752 synchronous_delivery = TRUE;
2753 arg_queue_only = FALSE;
2754 queue_only_set = TRUE;
2755 }
2756
2757 /* -odq: queue only */
2758
2759 else if (Ustrcmp(argrest, "dq") == 0)
2760 {
2761 synchronous_delivery = FALSE;
2762 arg_queue_only = TRUE;
2763 queue_only_set = TRUE;
2764 }
2765
2766 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2767 but no remote delivery */
2768
2769 else if (Ustrcmp(argrest, "dqs") == 0)
2770 {
2771 queue_smtp = TRUE;
2772 arg_queue_only = FALSE;
2773 queue_only_set = TRUE;
2774 }
2775
2776 /* -oex: Sendmail error flags. As these are also accepted without the
2777 leading -o prefix, for compatibility with vacation and other callers,
2778 they are handled with -e above. */
2779
2780 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2781 -oitrue: Another sendmail syntax for the same */
2782
2783 else if (Ustrcmp(argrest, "i") == 0 ||
2784 Ustrcmp(argrest, "itrue") == 0)
2785 dot_ends = FALSE;
2786
2787 /* -oM*: Set various characteristics for an incoming message; actually
2788 acted on for trusted callers only. */
2789
2790 else if (*argrest == 'M')
2791 {
2792 if (i+1 >= argc)
2793 {
2794 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2795 exit(EXIT_FAILURE);
2796 }
2797
2798 /* -oMa: Set sender host address */
2799
2800 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2801
2802 /* -oMaa: Set authenticator name */
2803
2804 else if (Ustrcmp(argrest, "Maa") == 0)
2805 sender_host_authenticated = argv[++i];
2806
2807 /* -oMas: setting authenticated sender */
2808
2809 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2810
2811 /* -oMai: setting authenticated id */
2812
2813 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2814
2815 /* -oMi: Set incoming interface address */
2816
2817 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2818
2819 /* -oMr: Received protocol */
2820
2821 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2822
2823 /* -oMs: Set sender host name */
2824
2825 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2826
2827 /* -oMt: Set sender ident */
2828
33d73e3b
PH
2829 else if (Ustrcmp(argrest, "Mt") == 0)
2830 {
2831 sender_ident_set = TRUE;
2832 sender_ident = argv[++i];
2833 }
059ec3d9
PH
2834
2835 /* Else a bad argument */
2836
2837 else
2838 {
2839 badarg = TRUE;
2840 break;
2841 }
2842 }
2843
2844 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2845 seem to call this as -m (undocumented), so that is also accepted (see
2846 above). */
2847
2848 else if (Ustrcmp(argrest, "m") == 0) {}
2849
2850 /* -oo: An ancient flag for old-style addresses which still seems to
2851 crop up in some calls (see in SCO). */
2852
2853 else if (Ustrcmp(argrest, "o") == 0) {}
2854
2855 /* -oP <name>: set pid file path for daemon */
2856
2857 else if (Ustrcmp(argrest, "P") == 0)
2858 override_pid_file_path = argv[++i];
2859
2860 /* -or <n>: set timeout for non-SMTP acceptance
2861 -os <n>: set timeout for SMTP acceptance */
2862
2863 else if (*argrest == 'r' || *argrest == 's')
2864 {
2865 int *tp = (*argrest == 'r')?
2866 &arg_receive_timeout : &arg_smtp_receive_timeout;
2867 if (argrest[1] == 0)
2868 {
2869 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2870 }
2871 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2872 if (*tp < 0)
2873 {
2874 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2875 exit(EXIT_FAILURE);
2876 }
2877 }
2878
2879 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2880
2881 else if (Ustrcmp(argrest, "X") == 0)
2882 override_local_interfaces = argv[++i];
2883
2884 /* Unknown -o argument */
2885
2886 else badarg = TRUE;
2887 break;
2888
2889
2890 /* -ps: force Perl startup; -pd force delayed Perl startup */
2891
2892 case 'p':
2893 #ifdef EXIM_PERL
2894 if (*argrest == 's' && argrest[1] == 0)
2895 {
2896 perl_start_option = 1;
2897 break;
2898 }
2899 if (*argrest == 'd' && argrest[1] == 0)
2900 {
2901 perl_start_option = -1;
2902 break;
2903 }
2904 #endif
2905
2906 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2907 which sets the host protocol and host name */
2908
2909 if (*argrest == 0)
2910 {
2911 if (i+1 < argc) argrest = argv[++i]; else
2912 { badarg = TRUE; break; }
2913 }
2914
2915 if (*argrest != 0)
2916 {
2917 uschar *hn = Ustrchr(argrest, ':');
2918 if (hn == NULL)
2919 {
2920 received_protocol = argrest;
2921 }
2922 else
2923 {
2924 received_protocol = string_copyn(argrest, hn - argrest);
2925 sender_host_name = hn + 1;
2926 }
2927 }
2928 break;
2929
2930
2931 case 'q':
2932 receiving_message = FALSE;
3cc66b45
PH
2933 if (queue_interval >= 0)
2934 {
2935 fprintf(stderr, "exim: -q specified more than once\n");
2936 exit(EXIT_FAILURE);
2937 }
059ec3d9
PH
2938
2939 /* -qq...: Do queue runs in a 2-stage manner */
2940
2941 if (*argrest == 'q')
2942 {
2943 queue_2stage = TRUE;
2944 argrest++;
2945 }
2946
2947 /* -qi...: Do only first (initial) deliveries */
2948
2949 if (*argrest == 'i')
2950 {
2951 queue_run_first_delivery = TRUE;
2952 argrest++;
2953 }
2954
2955 /* -qf...: Run the queue, forcing deliveries
2956 -qff..: Ditto, forcing thawing as well */
2957
2958 if (*argrest == 'f')
2959 {
2960 queue_run_force = TRUE;
2961 if (*(++argrest) == 'f')
2962 {
2963 deliver_force_thaw = TRUE;
2964 argrest++;
2965 }
2966 }
2967
2968 /* -q[f][f]l...: Run the queue only on local deliveries */
2969
2970 if (*argrest == 'l')
2971 {
2972 queue_run_local = TRUE;
2973 argrest++;
2974 }
2975
2976 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2977 optionally starting from a given message id. */
2978
2979 if (*argrest == 0 &&
2980 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2981 {
2982 queue_interval = 0;
2983 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2984 start_queue_run_id = argv[++i];
2985 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2986 stop_queue_run_id = argv[++i];
2987 }
2988
2989 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2990 optionally local only. */
2991
2992 else
2993 {
2994 if (*argrest != 0)
2995 queue_interval = readconf_readtime(argrest, 0, FALSE);
2996 else
2997 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2998 if (queue_interval <= 0)
2999 {
3000 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3001 exit(EXIT_FAILURE);
3002 }
3003 }
3004 break;
3005
3006
3007 case 'R': /* Synonymous with -qR... */
3008 receiving_message = FALSE;
3009
3010 /* -Rf: As -R (below) but force all deliveries,
3011 -Rff: Ditto, but also thaw all frozen messages,
3012 -Rr: String is regex
3013 -Rrf: Regex and force
3014 -Rrff: Regex and force and thaw
3015
3016 in all cases provided there are no further characters in this
3017 argument. */
3018
3019 if (*argrest != 0)
3020 {
3021 int i;
3022 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3023 {
3024 if (Ustrcmp(argrest, rsopts[i]) == 0)
3025 {
3026 if (i != 2) queue_run_force = TRUE;
3027 if (i >= 2) deliver_selectstring_regex = TRUE;
3028 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3029 argrest += Ustrlen(rsopts[i]);
3030 }
3031 }
3032 }
3033
3034 /* -R: Set string to match in addresses for forced queue run to
3035 pick out particular messages. */
3036
3037 if (*argrest == 0)
3038 {
3039 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3040 {
3041 fprintf(stderr, "exim: string expected after -R\n");
3042 exit(EXIT_FAILURE);
3043 }
3044 }
3045 else deliver_selectstring = argrest;
059ec3d9
PH
3046 break;
3047
3048
3049 /* -r: an obsolete synonym for -f (see above) */
3050
3051
3052 /* -S: Like -R but works on sender. */
3053
3054 case 'S': /* Synonymous with -qS... */
3055 receiving_message = FALSE;
3056
3057 /* -Sf: As -S (below) but force all deliveries,
3058 -Sff: Ditto, but also thaw all frozen messages,
3059 -Sr: String is regex
3060 -Srf: Regex and force
3061 -Srff: Regex and force and thaw
3062
3063 in all cases provided there are no further characters in this
3064 argument. */
3065
3066 if (*argrest != 0)
3067 {
3068 int i;
3069 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3070 {
3071 if (Ustrcmp(argrest, rsopts[i]) == 0)
3072 {
3073 if (i != 2) queue_run_force = TRUE;
3074 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3075 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3076 argrest += Ustrlen(rsopts[i]);
3077 }
3078 }
3079 }
3080
3081 /* -S: Set string to match in addresses for forced queue run to
3082 pick out particular messages. */
3083
3084 if (*argrest == 0)
3085 {
3086 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3087 {
3088 fprintf(stderr, "exim: string expected after -S\n");
3089 exit(EXIT_FAILURE);
3090 }
3091 }
3092 else deliver_selectstring_sender = argrest;
059ec3d9
PH
3093 break;
3094
3095 /* -Tqt is an option that is exclusively for use by the testing suite.
3096 It is not recognized in other circumstances. It allows for the setting up
3097 of explicit "queue times" so that various warning/retry things can be
3098 tested. Otherwise variability of clock ticks etc. cause problems. */
3099
3100 case 'T':
3101 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3102 fudged_queue_times = argv[++i];
3103 else badarg = TRUE;
3104 break;
3105
3106
3107 /* -t: Set flag to extract recipients from body of message. */
3108
3109 case 't':
3110 if (*argrest == 0) extract_recipients = TRUE;
3111
3112 /* -ti: Set flag to extract recipients from body of message, and also
3113 specify that dot does not end the message. */
3114
3115 else if (Ustrcmp(argrest, "i") == 0)
3116 {
3117 extract_recipients = TRUE;
3118 dot_ends = FALSE;
3119 }
3120
3121 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3122
3123 #ifdef SUPPORT_TLS
3124 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3125 #endif
3126
3127 else badarg = TRUE;
3128 break;
3129
3130
3131 /* -U: This means "initial user submission" in sendmail, apparently. The
3132 doc claims that in future sendmail may refuse syntactically invalid
3133 messages instead of fixing them. For the moment, we just ignore it. */
3134
3135 case 'U':
3136 break;
3137
3138
3139 /* -v: verify things - this is a very low-level debugging */
3140
3141 case 'v':
3142 if (*argrest == 0)
3143 {
3144 debug_selector |= D_v;
3145 debug_file = stderr;
3146 }
3147 else badarg = TRUE;
3148 break;
3149
3150
3151 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3152
3153 The -x flag tells the sendmail command that mail from a local
3154 mail program has National Language Support (NLS) extended characters
3155 in the body of the mail item. The sendmail command can send mail with
3156 extended NLS characters across networks that normally corrupts these
3157 8-bit characters.
3158
3159 As Exim is 8-bit clean, it just ignores this flag. */
3160
3161 case 'x':
3162 if (*argrest != 0) badarg = TRUE;
3163 break;
3164
3165 /* All other initial characters are errors */
3166
3167 default:
3168 badarg = TRUE;
3169 break;
3170 } /* End of high-level switch statement */
3171
3172 /* Failed to recognize the option, or syntax error */
3173
3174 if (badarg)
3175 {
3176 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3177 "option %s\n", arg);
3178 exit(EXIT_FAILURE);
3179 }
3180 }
3181
3182
3cc66b45
PH
3183/* If -R or -S have been specified without -q, assume a single queue run. */
3184
3185if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3186 queue_interval < 0) queue_interval = 0;
3187
3188
059ec3d9 3189END_ARG:
81ea09ca
NM
3190/* If usage_wanted is set we call the usage function - which never returns */
3191if (usage_wanted) exim_usage(called_as);
3192
3193/* Arguments have been processed. Check for incompatibilities. */
059ec3d9
PH
3194if ((
3195 (smtp_input || extract_recipients || recipients_arg < argc) &&
3196 (daemon_listen || queue_interval >= 0 || bi_option ||
3197 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
f05da2e8 3198 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
059ec3d9
PH
3199 ) ||
3200 (
3201 msg_action_arg > 0 &&
0ef732d9
PH
3202 (daemon_listen || queue_interval >= 0 || list_options ||
3203 (checking && msg_action != MSG_LOAD) ||
3204 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
059ec3d9
PH
3205 ) ||
3206 (
3207 (daemon_listen || queue_interval >= 0) &&
3208 (sender_address != NULL || list_options || list_queue || checking ||
0ef732d9 3209 bi_option)
059ec3d9
PH
3210 ) ||
3211 (
3212 daemon_listen && queue_interval == 0
3213 ) ||
3214 (
3215 list_options &&
3216 (checking || smtp_input || extract_recipients ||
f05da2e8 3217 filter_test != FTEST_NONE || bi_option)
059ec3d9
PH
3218 ) ||
3219 (
3220 verify_address_mode &&
3221 (address_test_mode || smtp_input || extract_recipients ||
f05da2e8 3222 filter_test != FTEST_NONE || bi_option)
059ec3d9
PH
3223 ) ||
3224 (
3225 address_test_mode && (smtp_input || extract_recipients ||
f05da2e8 3226 filter_test != FTEST_NONE || bi_option)
059ec3d9
PH
3227 ) ||
3228 (
f05da2e8 3229 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
059ec3d9
PH
3230 extract_recipients)
3231 ) ||
3232 (
3233 deliver_selectstring != NULL && queue_interval < 0
328895cc
PH
3234 ) ||
3235 (
3236 msg_action == MSG_LOAD &&
3237 (!expansion_test || expansion_test_message != NULL)
059ec3d9
PH
3238 )
3239 )
3240 {
3241 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3242 exit(EXIT_FAILURE);
3243 }
3244
3245/* If debugging is set up, set the file and the file descriptor to pass on to
3246child processes. It should, of course, be 2 for stderr. Also, force the daemon
3247to run in the foreground. */
3248
3249if (debug_selector != 0)
3250 {
3251 debug_file = stderr;
3252 debug_fd = fileno(debug_file);
3253 background_daemon = FALSE;
3254 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3255 if (debug_selector != D_v) /* -v only doesn't show this */
3256 {
3257 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3258 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3259 debug_selector);
6545de78
PP
3260 if (!version_printed)
3261 show_whats_supported(stderr);
059ec3d9
PH
3262 }
3263 }
3264
3265/* When started with root privilege, ensure that the limits on the number of
3266open files and the number of processes (where that is accessible) are
3267sufficiently large, or are unset, in case Exim has been called from an
3268environment where the limits are screwed down. Not all OS have the ability to
3269change some of these limits. */
3270
3271if (unprivileged)
3272 {
3273 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3274 }
3275else
3276 {
3277 struct rlimit rlp;
3278
3279 #ifdef RLIMIT_NOFILE
3280 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3281 {
3282 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3283 strerror(errno));
3284 rlp.rlim_cur = rlp.rlim_max = 0;
3285 }
eb2c0248
PH
3286
3287 /* I originally chose 1000 as a nice big number that was unlikely to
a494b1e1
PH
3288 be exceeded. It turns out that some older OS have a fixed upper limit of
3289 256. */
eb2c0248 3290
059ec3d9
PH
3291 if (rlp.rlim_cur < 1000)
3292 {
3293 rlp.rlim_cur = rlp.rlim_max = 1000;
3294 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
eb2c0248 3295 {
a494b1e1
PH
3296 rlp.rlim_cur = rlp.rlim_max = 256;
3297 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3298 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3299 strerror(errno));
eb2c0248 3300 }
059ec3d9
PH
3301 }
3302 #endif
3303
3304 #ifdef RLIMIT_NPROC
3305 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3306 {
3307 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3308 strerror(errno));
3309 rlp.rlim_cur = rlp.rlim_max = 0;
3310 }
3311
3312 #ifdef RLIM_INFINITY
3313 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3314 {
3315 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3316 #else
3317 if (rlp.rlim_cur < 1000)
3318 {
3319 rlp.rlim_cur = rlp.rlim_max = 1000;
3320 #endif
3321 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3322 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3323 strerror(errno));
3324 }
3325 #endif
3326 }
3327
3328/* Exim is normally entered as root (but some special configurations are
3329possible that don't do this). However, it always spins off sub-processes that
3330set their uid and gid as required for local delivery. We don't want to pass on
3331any extra groups that root may belong to, so we want to get rid of them all at
3332this point.
3333
3334We need to obey setgroups() at this stage, before possibly giving up root
3335privilege for a changed configuration file, but later on we might need to
3336check on the additional groups for the admin user privilege - can't do that
3337till after reading the config, which might specify the exim gid. Therefore,
3338save the group list here first. */
3339
3340group_count = getgroups(NGROUPS_MAX, group_list);
cd59ab18
PP
3341if (group_count < 0)
3342 {
3343 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3344 exit(EXIT_FAILURE);
3345 }
059ec3d9
PH
3346
3347/* There is a fundamental difference in some BSD systems in the matter of
3348groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3349known not to be different. On the "different" systems there is a single group
3350list, and the first entry in it is the current group. On all other versions of
3351Unix there is a supplementary group list, which is in *addition* to the current
3352group. Consequently, to get rid of all extraneous groups on a "standard" system
3353you pass over 0 groups to setgroups(), while on a "different" system you pass
3354over a single group - the current group, which is always the first group in the
3355list. Calling setgroups() with zero groups on a "different" system results in
3356an error return. The following code should cope with both types of system.
3357
3358However, if this process isn't running as root, setgroups() can't be used
3359since you have to be root to run it, even if throwing away groups. Not being
3360root here happens only in some unusual configurations. We just ignore the
3361error. */
3362
3363if (setgroups(0, NULL) != 0)
3364 {
3365 if (setgroups(1, group_list) != 0 && !unprivileged)
3366 {
3367 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3368 exit(EXIT_FAILURE);
3369 }
3370 }
3371
3372/* If the configuration file name has been altered by an argument on the
3373command line (either a new file name or a macro definition) and the caller is
cd25e41d
DW
3374not root, or if this is a filter testing run, remove any setuid privilege the
3375program has and run as the underlying user.
059ec3d9 3376
cd25e41d
DW
3377The exim user is locked out of this, which severely restricts the use of -C
3378for some purposes.
059ec3d9
PH
3379
3380Otherwise, set the real ids to the effective values (should be root unless run
3381from inetd, which it can either be root or the exim uid, if one is configured).
3382
3383There is a private mechanism for bypassing some of this, in order to make it
3384possible to test lots of configurations automatically, without having either to
3385recompile each time, or to patch in an actual configuration file name and other
3386values (such as the path name). If running in the test harness, pretend that
3387configuration file changes and macro definitions haven't happened. */
3388
3389if (( /* EITHER */
a7cbbf50
PP
3390 (!trusted_config || /* Config changed, or */
3391 !macros_trusted()) && /* impermissible macros and */
059ec3d9 3392 real_uid != root_uid && /* Not root, and */
059ec3d9
PH
3393 !running_in_test_harness /* Not fudged */
3394 ) || /* OR */
3395 expansion_test /* expansion testing */
3396 || /* OR */
f05da2e8 3397 filter_test != FTEST_NONE) /* Filter testing */
059ec3d9
PH
3398 {
3399 setgroups(group_count, group_list);
3400 exim_setugid(real_uid, real_gid, FALSE,
3401 US"-C, -D, -be or -bf forces real uid");
3402 removed_privilege = TRUE;
3403
3404 /* In the normal case when Exim is called like this, stderr is available
3405 and should be used for any logging information because attempts to write
3406 to the log will usually fail. To arrange this, we unset really_exim. However,
3407 if no stderr is available there is no point - we might as well have a go
b7487bce 3408 at the log (if it fails, syslog will be written).
059ec3d9 3409
b7487bce
PP
3410 Note that if the invoker is Exim, the logs remain available. Messing with
3411 this causes unlogged successful deliveries. */
3412
3413 if ((log_stderr != NULL) && (real_uid != exim_uid))
3414 really_exim = FALSE;
059ec3d9
PH
3415 }
3416
3417/* Privilege is to be retained for the moment. It may be dropped later,
3418depending on the job that this Exim process has been asked to do. For now, set
3419the real uid to the effective so that subsequent re-execs of Exim are done by a
3420privileged user. */
3421
3422else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3423
f05da2e8 3424/* If testing a filter, open the file(s) now, before wasting time doing other
059ec3d9
PH
3425setups and reading the message. */
3426
f05da2e8
PH
3427if ((filter_test & FTEST_SYSTEM) != 0)
3428 {
3429 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3430 if (filter_sfd < 0)
3431 {
3432 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3433 strerror(errno));
3434 return EXIT_FAILURE;
3435 }
3436 }
3437
3438if ((filter_test & FTEST_USER) != 0)
059ec3d9 3439 {
f05da2e8
PH
3440 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3441 if (filter_ufd < 0)
059ec3d9 3442 {
f05da2e8 3443 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
059ec3d9
PH
3444 strerror(errno));
3445 return EXIT_FAILURE;
3446 }
3447 }
3448
3449/* Read the main runtime configuration data; this gives up if there
3450is a failure. It leaves the configuration file open so that the subsequent
3451configuration data for delivery can be read if needed. */
3452
3453readconf_main();
3454
3455/* Handle the decoding of logging options. */
3456
ed7f7860
PP
3457decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3458 log_selector_string, log_options, log_options_count, US"log", 0);
059ec3d9
PH
3459
3460DEBUG(D_any)
3461 {
3462 debug_printf("configuration file is %s\n", config_main_filename);
3463 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3464 log_extra_selector);
3465 }
3466
3467/* If domain literals are not allowed, check the sender address that was
3468supplied with -f. Ditto for a stripped trailing dot. */
3469
3470if (sender_address != NULL)
3471 {
3472 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3473 {
3474 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3475 "allowed\n", sender_address);
3476 return EXIT_FAILURE;
3477 }
3478 if (f_end_dot && !strip_trailing_dot)
3479 {
3480 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3481 "(trailing dot not allowed)\n", sender_address);
3482 return EXIT_FAILURE;
3483 }
3484 }
3485
3486/* Paranoia check of maximum lengths of certain strings. There is a check
3487on the length of the log file path in log.c, which will come into effect
3488if there are any calls to write the log earlier than this. However, if we
3489get this far but the string is very long, it is better to stop now than to
3490carry on and (e.g.) receive a message and then have to collapse. The call to
3491log_write() from here will cause the ultimate panic collapse if the complete
3492file name exceeds the buffer length. */
3493
3494if (Ustrlen(log_file_path) > 200)
3495 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3496 "log_file_path is longer than 200 chars: aborting");
3497
3498if (Ustrlen(pid_file_path) > 200)
3499 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3500 "pid_file_path is longer than 200 chars: aborting");
3501
3502if (Ustrlen(spool_directory) > 200)
3503 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3504 "spool_directory is longer than 200 chars: aborting");
3505
3506/* Length check on the process name given to syslog for its TAG field,
3507which is only permitted to be 32 characters or less. See RFC 3164. */
3508
3509if (Ustrlen(syslog_processname) > 32)
3510 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3511 "syslog_processname is longer than 32 chars: aborting");
3512
3513/* In some operating systems, the environment variable TMPDIR controls where
3514temporary files are created; Exim doesn't use these (apart from when delivering
3515to MBX mailboxes), but called libraries such as DBM libraries may require them.
3516If TMPDIR is found in the environment, reset it to the value defined in the
3517TMPDIR macro, if this macro is defined. */
3518
3519#ifdef TMPDIR
3520 {
3521 uschar **p;
3522 for (p = USS environ; *p != NULL; p++)
3523 {
3524 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3525 Ustrcmp(*p+7, TMPDIR) != 0)
3526 {
3527 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3528 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3529 *p = newp;
3530 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3531 }
3532 }
3533 }
3534#endif
3535
3536/* Timezone handling. If timezone_string is "utc", set a flag to cause all
3537timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3538we may need to get rid of a bogus timezone setting. This can arise when Exim is
3539called by a user who has set the TZ variable. This then affects the timestamps
3540in log files and in Received: headers, and any created Date: header lines. The
3541required timezone is settable in the configuration file, so nothing can be done
3542about this earlier - but hopefully nothing will normally be logged earlier than
3543this. We have to make a new environment if TZ is wrong, but don't bother if
3544timestamps_utc is set, because then all times are in UTC anyway. */
3545
3546if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3547 {
3548 timestamps_utc = TRUE;
3549 }
3550else
3551 {
3552 uschar *envtz = US getenv("TZ");
3553 if ((envtz == NULL && timezone_string != NULL) ||
3554 (envtz != NULL &&
3555 (timezone_string == NULL ||
3556 Ustrcmp(timezone_string, envtz) != 0)))
3557 {
3558 uschar **p = USS environ;
3559 uschar **new;
3560 uschar **newp;
3561 int count = 0;
3562 while (*p++ != NULL) count++;
3563 if (envtz == NULL) count++;
3564 newp = new = malloc(sizeof(uschar *) * (count + 1));
3565 for (p = USS environ; *p != NULL; p++)
3566 {
3567 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3568 *newp++ = *p;
3569 }
3570 if (timezone_string != NULL)
3571 {
3572 *newp = malloc(Ustrlen(timezone_string) + 4);
3573 sprintf(CS *newp++, "TZ=%s", timezone_string);
3574 }
3575 *newp = NULL;
3576 environ = CSS new;
3577 tzset();
3578 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3579 tod_stamp(tod_log));
3580 }
3581 }
3582
3583/* Handle the case when we have removed the setuid privilege because of -C or
cd25e41d 3584-D. This means that the caller of Exim was not root.
059ec3d9 3585
cd25e41d
DW
3586There is a problem if we were running as the Exim user. The sysadmin may
3587expect this case to retain privilege because "the binary was called by the
3588Exim user", but it hasn't, because either the -D option set macros, or the
261dc43e 3589-C option set a non-trusted configuration file. There are two possibilities:
059ec3d9
PH
3590
3591 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3592 to do message deliveries. Thus, the fact that it is running as a
3593 non-privileged user is plausible, and might be wanted in some special
3594 configurations. However, really_exim will have been set false when
3595 privilege was dropped, to stop Exim trying to write to its normal log
3596 files. Therefore, re-enable normal log processing, assuming the sysadmin
3597 has set up the log directory correctly.
3598
3599 (2) If deliver_drop_privilege is not set, the configuration won't work as
3600 apparently intended, and so we log a panic message. In order to retain
261dc43e
DW
3601 root for -C or -D, the caller must either be root or be invoking a
3602 trusted configuration file (when deliver_drop_privilege is false). */
059ec3d9 3603
e2f5dc15 3604if (removed_privilege && (!trusted_config || macros != NULL) &&
059ec3d9
PH
3605 real_uid == exim_uid)
3606 {
059ec3d9
PH
3607 if (deliver_drop_privilege)
3608 really_exim = TRUE; /* let logging work normally */
3609 else
3610 log_write(0, LOG_MAIN|LOG_PANIC,
cd25e41d 3611 "exim user lost privilege for using %s option",
90b6341f 3612 trusted_config? "-D" : "-C");
059ec3d9
PH
3613 }
3614
3615/* Start up Perl interpreter if Perl support is configured and there is a
3616perl_startup option, and the configuration or the command line specifies
3617initializing starting. Note that the global variables are actually called
3618opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3619
3620#ifdef EXIM_PERL
3621if (perl_start_option != 0)
3622 opt_perl_at_start = (perl_start_option > 0);
3623if (opt_perl_at_start && opt_perl_startup != NULL)
3624 {
3625 uschar *errstr;
3626 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3627 errstr = init_perl(opt_perl_startup);
3628 if (errstr != NULL)
3629 {
3630 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3631 return EXIT_FAILURE;
3632 }
3633 opt_perl_started = TRUE;
3634 }
3635#endif /* EXIM_PERL */
3636
6545de78
PP
3637/* Initialise lookup_list
3638If debugging, already called above via version reporting.
3639This does mean that debugging causes the list to be initialised while root.
3640This *should* be harmless -- all modules are loaded from a fixed dir and
3641it's code that would, if not a module, be part of Exim already. */
e6d225ae
DW
3642init_lookup_list();
3643
059ec3d9
PH
3644/* Log the arguments of the call if the configuration file said so. This is
3645a debugging feature for finding out what arguments certain MUAs actually use.
3646Don't attempt it if logging is disabled, or if listing variables or if
3647verifying/testing addresses or expansions. */
3648
31619da6
PH
3649if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3650 && really_exim && !list_options && !checking)
059ec3d9
PH
3651 {
3652 int i;
3653 uschar *p = big_buffer;
3654 Ustrcpy(p, "cwd=");
3655 (void)getcwd(CS p+4, big_buffer_size - 4);
3656 while (*p) p++;
3657 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3658 while (*p) p++;
3659 for (i = 0; i < argc; i++)
3660 {
3661 int len = Ustrlen(argv[i]);
3662 uschar *printing;
3663 uschar *quote;
3664 if (p + len + 8 >= big_buffer + big_buffer_size)
3665 {
3666 Ustrcpy(p, " ...");
3667 log_write(0, LOG_MAIN, "%s", big_buffer);
3668 Ustrcpy(big_buffer, "...");
3669 p = big_buffer + 3;
3670 }
3671 printing = string_printing(argv[i]);
3672 if (printing[0] == 0) quote = US"\""; else
3673 {
3674 uschar *pp = printing;
3675 quote = US"";
3676 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3677 }
3678 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3679 (p - big_buffer) - 4), printing, quote);
3680 while (*p) p++;
3681 }
31619da6
PH
3682
3683 if ((log_extra_selector & LX_arguments) != 0)
3684 log_write(0, LOG_MAIN, "%s", big_buffer);
3685 else
3686 debug_printf("%s\n", big_buffer);
059ec3d9
PH
3687 }
3688
3689/* Set the working directory to be the top-level spool directory. We don't rely
3690on this in the code, which always uses fully qualified names, but it's useful
3691for core dumps etc. Don't complain if it fails - the spool directory might not
3692be generally accessible and calls with the -C option (and others) have lost
ba18e66a
PH
3693privilege by now. Before the chdir, we try to ensure that the directory exists.
3694*/
059ec3d9
PH
3695
3696if (Uchdir(spool_directory) != 0)
3697 {
ba18e66a 3698 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
059ec3d9
PH
3699 (void)Uchdir(spool_directory);
3700 }
3701
3702/* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3703alias file. Exim doesn't have such a concept, but this call is screwed into
3704Sun's YP makefiles. Handle this by calling a configured script, as the real
3705user who called Exim. The -oA option can be used to pass an argument to the
3706script. */
3707
3708if (bi_option)
3709 {
1fe64dcc 3710 (void)fclose(config_file);
059ec3d9
PH
3711 if (bi_command != NULL)
3712 {
3713 int i = 0;
3714 uschar *argv[3];
3715 argv[i++] = bi_command;
3716 if (alias_arg != NULL) argv[i++] = alias_arg;
3717 argv[i++] = NULL;
3718
3719 setgroups(group_count, group_list);
3720 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3721
3722 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3723 (argv[1] == NULL)? US"" : argv[1]);
3724
3725 execv(CS argv[0], (char *const *)argv);
3726 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3727 exit(EXIT_FAILURE);
3728 }
3729 else
3730 {
3731 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3732 exit(EXIT_SUCCESS);
3733 }
3734 }
3735
3736/* If an action on specific messages is requested, or if a daemon or queue
3737runner is being started, we need to know if Exim was called by an admin user.
3738This is the case if the real user is root or exim, or if the real group is
3739exim, or if one of the supplementary groups is exim or a group listed in
3740admin_groups. We don't fail all message actions immediately if not admin_user,
3741since some actions can be performed by non-admin users. Instead, set admin_user
3742for later interrogation. */
3743
3744if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3745 admin_user = TRUE;
3746else
3747 {
3748 int i, j;
059ec3d9
PH
3749 for (i = 0; i < group_count; i++)
3750 {
3751 if (group_list[i] == exim_gid) admin_user = TRUE;
3752 else if (admin_groups != NULL)
3753 {
3754 for (j = 1; j <= (int)(admin_groups[0]); j++)
3755 if (admin_groups[j] == group_list[i])
3756 { admin_user = TRUE; break; }
3757 }
3758 if (admin_user) break;
3759 }
3760 }
3761
3762/* Another group of privileged users are the trusted users. These are root,
3763exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3764are permitted to specify sender_addresses with -f on the command line, and
3765other message parameters as well. */
3766
3767if (real_uid == root_uid || real_uid == exim_uid)
3768 trusted_caller = TRUE;
3769else
3770 {
3771 int i, j;
3772
3773 if (trusted_users != NULL)
3774 {
3775 for (i = 1; i <= (int)(trusted_users[0]); i++)
3776 if (trusted_users[i] == real_uid)
3777 { trusted_caller = TRUE; break; }
3778 }
3779
3780 if (!trusted_caller && trusted_groups != NULL)
3781 {
3782 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3783 {
3784 if (trusted_groups[i] == real_gid)
3785 trusted_caller = TRUE;
3786 else for (j = 0; j < group_count; j++)
3787 {
3788 if (trusted_groups[i] == group_list[j])
3789 { trusted_caller = TRUE; break; }
3790 }
3791 if (trusted_caller) break;
3792 }
3793 }
3794 }
3795
3796if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3797if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3798
3799/* Only an admin user may start the daemon or force a queue run in the default
3800configuration, but the queue run restriction can be relaxed. Only an admin
3801user may request that a message be returned to its sender forthwith. Only an
3802admin user may specify a debug level greater than D_v (because it might show
3803passwords, etc. in lookup queries). Only an admin user may request a queue
8544e77a
PP
3804count. Only an admin user can use the test interface to scan for email
3805(because Exim will be in the spool dir and able to look at mails). */
059ec3d9
PH
3806
3807if (!admin_user)
3808 {
3809 BOOL debugset = (debug_selector & ~D_v) != 0;
8544e77a 3810 if (deliver_give_up || daemon_listen || malware_test_file ||
059ec3d9
PH
3811 (count_queue && queue_list_requires_admin) ||
3812 (list_queue && queue_list_requires_admin) ||
3813 (queue_interval >= 0 && prod_requires_admin) ||
3814 (debugset && !running_in_test_harness))
3815 {
3816 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3817 exit(EXIT_FAILURE);
3818 }
3819 }
3820
3821/* If the real user is not root or the exim uid, the argument for passing
3822in an open TCP/IP connection for another message is not permitted, nor is
3823running with the -N option for any delivery action, unless this call to exim is
3824one that supplied an input message, or we are using a patched exim for
3825regression testing. */
3826
3827if (real_uid != root_uid && real_uid != exim_uid &&
3828 (continue_hostname != NULL ||
3829 (dont_deliver &&
3830 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3831 )) && !running_in_test_harness)
3832 {
3833 fprintf(stderr, "exim: Permission denied\n");
3834 return EXIT_FAILURE;
3835 }
3836
3837/* If the caller is not trusted, certain arguments are ignored when running for
f05da2e8
PH
3838real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3839Note that authority for performing certain actions on messages is tested in the
059ec3d9
PH
3840queue_action() function. */
3841
f05da2e8 3842if (!trusted_caller && !checking && filter_test == FTEST_NONE)
059ec3d9
PH
3843 {
3844 sender_host_name = sender_host_address = interface_address =
3845 sender_ident = received_protocol = NULL;
3846 sender_host_port = interface_port = 0;
3847 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3848 }
3849
3850/* If a sender host address is set, extract the optional port number off the
3851end of it and check its syntax. Do the same thing for the interface address.
3852Exim exits if the syntax is bad. */
3853
3854else
3855 {
3856 if (sender_host_address != NULL)
3857 sender_host_port = check_port(sender_host_address);
3858 if (interface_address != NULL)
3859 interface_port = check_port(interface_address);
3860 }
3861
3862/* If an SMTP message is being received check to see if the standard input is a
3863TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3864caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3865barf. */
3866
3867if (smtp_input)
3868 {
3869 union sockaddr_46 inetd_sock;
36a3b041 3870 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
059ec3d9
PH
3871 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3872 {
3873 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3874 if (family == AF_INET || family == AF_INET6)
3875 {
3876 union sockaddr_46 interface_sock;
3877 size = sizeof(interface_sock);
3878
3879 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3880 interface_address = host_ntoa(-1, &interface_sock, NULL,
3881 &interface_port);
3882
3883 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3884
3885 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3886 {
3887 is_inetd = TRUE;
3888 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3889 NULL, &sender_host_port);
3890 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3891 "inetd is not supported when mua_wrapper is set");
3892 }
3893 else
3894 {
3895 fprintf(stderr,
3896 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3897 return EXIT_FAILURE;
3898 }
3899 }
3900 }
3901 }
3902
3903/* If the load average is going to be needed while receiving a message, get it
3904now for those OS that require the first call to os_getloadavg() to be done as
3905root. There will be further calls later for each message received. */
3906
3907#ifdef LOAD_AVG_NEEDS_ROOT
3908if (receiving_message &&
3909 (queue_only_load >= 0 ||
3910 (is_inetd && smtp_load_reserve >= 0)
3911 ))
3912 {
8669f003 3913 load_average = OS_GETLOADAVG();
059ec3d9
PH
3914 }
3915#endif
3916
3917/* The queue_only configuration option can be overridden by -odx on the command
3918line, except that if queue_only_override is false, queue_only cannot be unset
3919from the command line. */
3920
3921if (queue_only_set && (queue_only_override || arg_queue_only))
3922 queue_only = arg_queue_only;
3923
3924/* The receive_timeout and smtp_receive_timeout options can be overridden by
3925-or and -os. */
3926
3927if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3928if (arg_smtp_receive_timeout >= 0)
3929 smtp_receive_timeout = arg_smtp_receive_timeout;
3930
3931/* If Exim was started with root privilege, unless we have already removed the
3932root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3933except when starting the daemon or doing some kind of delivery or address
3934testing (-bt). These are the only cases when root need to be retained. We run
3935as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
805e5aab
TF
3936retained only for starting the daemon. We always do the initgroups() in this
3937situation (controlled by the TRUE below), in order to be as close as possible
3938to the state Exim usually runs in. */
059ec3d9
PH
3939
3940if (!unprivileged && /* originally had root AND */
3941 !removed_privilege && /* still got root AND */
3942 !daemon_listen && /* not starting the daemon */
3943 queue_interval <= 0 && /* (either kind of daemon) */
3944 ( /* AND EITHER */
3945 deliver_drop_privilege || /* requested unprivileged */
3946 ( /* OR */
3947 queue_interval < 0 && /* not running the queue */
3948 (msg_action_arg < 0 || /* and */
3949 msg_action != MSG_DELIVER) && /* not delivering and */
3950 (!checking || !address_test_mode) /* not address checking */
3951 )
3952 ))
3953 {
805e5aab 3954 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
059ec3d9
PH
3955 }
3956
3957/* When we are retaining a privileged uid, we still change to the exim gid. */
3958
1670ef10
PP
3959else
3960 {
3961 int rv;
3962 rv = setgid(exim_gid);
3963 /* Impact of failure is that some stuff might end up with an incorrect group.
3964 We track this for failures from root, since any attempt to change privilege
3965 by root should succeed and failures should be examined. For non-root,
3966 there's no security risk. For me, it's { exim -bV } on a just-built binary,
3967 no need to complain then. */
3968 if (rv == -1)
3969 {
33191679 3970 if (!(unprivileged || removed_privilege))
1670ef10
PP
3971 {
3972 fprintf(stderr,
3973 "exim: changing group failed: %s\n", strerror(errno));
3974 exit(EXIT_FAILURE);
3975 }
3976 else
33191679 3977 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
1670ef10
PP
3978 (long int)exim_gid, strerror(errno));
3979 }
3980 }
059ec3d9 3981
8544e77a
PP
3982/* Handle a request to scan a file for malware */
3983if (malware_test_file)
3984 {
dbc4b90d 3985#ifdef WITH_CONTENT_SCAN
8544e77a
PP
3986 int result;
3987 set_process_info("scanning file for malware");
3988 result = malware_in_file(malware_test_file);
3989 if (result == FAIL)
3990 {
3991 printf("No malware found.\n");
3992 exit(EXIT_SUCCESS);
3993 }
3994 if (result != OK)
3995 {
3996 printf("Malware lookup returned non-okay/fail: %d\n", result);
3997 exit(EXIT_FAILURE);
3998 }
3999 if (malware_name)
4000 printf("Malware found: %s\n", malware_name);
4001 else
4002 printf("Malware scan detected malware of unknown name.\n");
dbc4b90d
PP
4003#else
4004 printf("Malware scanning not enabled at compile time.\n");
4005#endif
8544e77a
PP
4006 exit(EXIT_FAILURE);
4007 }
4008
059ec3d9
PH
4009/* Handle a request to list the delivery queue */
4010
4011if (list_queue)
4012 {
4013 set_process_info("listing the queue");
4014 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4015 exit(EXIT_SUCCESS);
4016 }
4017
4018/* Handle a request to count the delivery queue */
4019
4020if (count_queue)
4021 {
4022 set_process_info("counting the queue");
4023 queue_count();
4024 exit(EXIT_SUCCESS);
4025 }
4026
0ef732d9
PH
4027/* Handle actions on specific messages, except for the force delivery and
4028message load actions, which are done below. Some actions take a whole list of
4029message ids, which are known to continue up to the end of the arguments. Others
4030take a single message id and then operate on the recipients list. */
059ec3d9 4031
0ef732d9 4032if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
059ec3d9
PH
4033 {
4034 int yield = EXIT_SUCCESS;
4035 set_process_info("acting on specified messages");
4036
4037 if (!one_msg_action)
4038 {
4039 for (i = msg_action_arg; i < argc; i++)
4040 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4041 yield = EXIT_FAILURE;
4042 }
4043
4044 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4045 recipients_arg)) yield = EXIT_FAILURE;
4046 exit(yield);